add common pipeline for main and 2.1.x branches (#1256)

.github/workflows/composites/build-controllers-project/action.yaml

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+name: build controllers project
+description: build controllers project
+runs:
+  using: "composite"
+  steps:
+    - name: build controllers project
+      shell: bash
+      run: |
+        cd spring-cloud-kubernetes-controllers
+        .././mvnw -T 1C -U clean install
+        cd ..

.github/workflows/composites/build-integration-tests-project/action.yaml

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+name: build integration tests project without tests
+description: build integration tests project without tests
+runs:
+  using: "composite"
+  steps:
+    - name: build integration tests project without tests
+      shell: bash
+      run: |
+        cd spring-cloud-kubernetes-integration-tests
+        # build the images, but dont run the tests
+        .././mvnw -T 1C clean install -DskipTests
+        cd ..

.github/workflows/composites/cache/action.yaml

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+name: cache
+description: cache
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/cache@v2
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-cache-${{ env.BRANCH_NAME }}-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+             ${{ runner.os }}-cache-${{ env.BRANCH_NAME }}-${{ hashFiles('**/pom.xml') }}

.github/workflows/composites/download-docker-images/action.yaml

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+# we are not going to use upload/download actions, since it is slower than cache usage
+# as key to the cache we are going to use DOCKER_IMAGES_KEY, which is the same as GITHUB_RUN_ID
+
+name: download docker images
+description: download docker images
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/cache@v2
+      with:
+        path: /tmp/docker/images
+        key: docker-images-cache-${{ env.DOCKER_IMAGES_KEY }}
+        restore-keys: docker-images-cache-${{ env.DOCKER_IMAGES_KEY }}
+
+

.github/workflows/composites/echo-saved-images/action.yaml

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+name: echo saved images
+description: echo saved images
+runs:
+  using: "composite"
+  steps:
+    - name: echo saved images
+      shell: bash
+      run: |
+        VIEW=$(ls -l /tmp/docker/images)
+        echo "${VIEW}"

.github/workflows/composites/env-variables/action.yaml

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+name: sets environment variables
+description: sets environment variables
+runs:
+  using: "composite"
+  steps:
+    - name: set env variables
+      shell: bash
+      run: |
+        
+        baseRef=$GITHUB_BASE_REF
+        if [[ ! -z $baseRef ]]; then
+          echo "This is a PR to branch : $baseRef"
+          echo "BASE_BRANCH=$(echo $baseRef)" >> $GITHUB_ENV
+        else 
+          raw=${{ github.ref }}
+          echo "${raw}"
+          branch=${raw##*/}
+          echo "This is a merge to branch : ${branch}"
+          echo "BASE_BRANCH=$(echo ${branch})" >> $GITHUB_ENV
+        fi
+        
+        echo "BRANCH_NAME=$(echo $GITHUB_HEAD_REF)" >> $GITHUB_ENV
+        echo "BASE_BRANCH_NAME=$(echo $GITHUB_BASE_REF)" >> $GITHUB_ENV
+        echo "DOCKER_IMAGES_KEY=$(echo $GITHUB_RUN_ID)" >> $GITHUB_ENV

.github/workflows/composites/fabric8-istio-integration-test/action.yaml

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+name: run fabric8 istio integration test
+description: run fabric8 istio integration test
+runs:
+  using: "composite"
+  steps:
+    - name: run fabric8 istio integration test
+      shell: bash
+      run: |
+        
+        cd spring-cloud-kubernetes-test-support
+        .././mvnw clean install
+        cd ..
+        
+        docker load -i /tmp/docker/images/spring-cloud-kubernetes-fabric8-istio-it.tar
+        cd spring-cloud-kubernetes-integration-tests/spring-cloud-kubernetes-fabric8-istio-it/
+        ../.././mvnw clean install -Dskip.build.image=true
+        cd ../..

.github/workflows/composites/fabric8-istio/action.yaml

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+# build a lightweight project so that dependencies for the
+# maven-surefire-plugin are downloaded and thus cached also
+
+name: build fabric8 istio project
+description: build fabric8 istio projects
+runs:
+  using: "composite"
+  steps:
+    - name: build fabric8 istio project
+      shell: bash
+      run: |
+        cd spring-cloud-kubernetes-fabric8-istio
+        .././mvnw -s ../.settings.xml clean install -U
+        cd ..

.github/workflows/composites/load-docker-images/action.yaml

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+name: install docker images
+description: load docker images from tar
+runs:
+  using: "composite"
+  steps:
+    - name: load docker images
+      shell: bash
+      run: |
+
+        # get the name of the images to load from children of spring-cloud-kubernetes-controllers
+        cd spring-cloud-kubernetes-controllers
+        while read controller_image; do
+          docker load -i /tmp/docker/images/${controller_image}.tar
+        done < <(mvn -Dexec.executable='echo' -Dexec.args='${project.artifactId}' exec:exec -q | grep -v 'spring-cloud-kubernetes-controllers')
+        cd ..
+
+        # get the name of the images to load from children of spring-cloud-kubernetes-integration-tests
+        cd spring-cloud-kubernetes-integration-tests
+        while read integration_test_image; do
+          docker load -i /tmp/docker/images/${integration_test_image}.tar
+        done < <(mvn -Dexec.executable='echo' -Dexec.args='${project.artifactId}' exec:exec -q \
+                        | grep -v 'spring-cloud-kubernetes-integration-tests' \
+                        | grep -v 'spring-cloud-kubernetes-client-configmap-event-reload-multiple-apps' \
+                        | grep -v 'spring-cloud-kubernetes-client-configuration-watcher-configmap-test-app' \
+                        | grep -v 'spring-cloud-kubernetes-client-secrets-event-reload-multiple-apps' \
+                        | grep -v 'spring-cloud-kubernetes-client-configuration-watcher-secrets-test-app' )
+        cd ..

.github/workflows/composites/save-controller-images/action.yaml

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+name: save controller docker images
+description: save controller docker images
+runs:
+  using: "composite"
+  steps:
+    - name: save controller docker images
+      shell: bash
+      run: |
+        mkdir -p /tmp/docker/images
+        TAG=$(./mvnw help:evaluate -Dexpression=project.version -q -DforceStdout)
+        cd spring-cloud-kubernetes-controllers
+        while read controller_image; do
+          docker save -o /tmp/docker/images/${controller_image}.tar docker.io/springcloud/${controller_image}:$TAG
+        done < <(mvn -Dexec.executable='echo' -Dexec.args='${project.artifactId}' exec:exec -q | grep -v 'spring-cloud-kubernetes-controllers')
+        cd ..

.github/workflows/composites/save-integration-tests-images/action.yaml

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+name: save integration tests docker images
+description: save integration tests docker images
+runs:
+  using: "composite"
+  steps:
+    - name: save integration tests docker images
+      shell: bash
+      run: |
+        mkdir -p /tmp/docker/images
+        TAG=$(./mvnw help:evaluate -Dexpression=project.version -q -DforceStdout)
+        cd spring-cloud-kubernetes-integration-tests
+        while read integ_test; do
+          docker save -o /tmp/docker/images/${integ_test}.tar docker.io/springcloud/${integ_test}:$TAG
+        done < <(mvn -Dexec.executable='echo' -Dexec.args='${project.artifactId}' exec:exec -q \
+                        | grep -v 'spring-cloud-kubernetes-integration-tests' \
+                        | grep -v 'spring-cloud-kubernetes-client-configmap-event-reload-multiple-apps' \
+                        | grep -v 'spring-cloud-kubernetes-client-configuration-watcher-configmap-test-app' \
+                        | grep -v 'spring-cloud-kubernetes-client-secrets-event-reload-multiple-apps' \
+                        | grep -v 'spring-cloud-kubernetes-client-configuration-watcher-secrets-test-app' )
+        cd ..

.github/workflows/composites/setup-jdk1.8/action.yaml

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+name: setup project with jdk-8
+description: setup project with jdk-8
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/setup-java@v2
+      with:
+        distribution: 'temurin'
+        java-version: '8'

.github/workflows/composites/setup-jdk17/action.yaml

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+name: setup project with jdk-17
+description: setup project with jdk-17
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/setup-java@v2
+      with:
+        distribution: 'temurin'
+        java-version: '17'

.github/workflows/composites/upload-docker-images/action.yaml

@@ -0,0 +1,15 @@
+# we are not going to use upload/download actions, since it is slower than cache usage
+# as key to the cache we are going to use DOCKER_IMAGES_KEY, which is the same as GITHUB_RUN_ID
+
+name: upload docker images
+description: upload docker images
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/cache@v2
+      with:
+        path: /tmp/docker/images
+        key: docker-images-cache-${{ env.DOCKER_IMAGES_KEY }}
+        restore-keys: docker-images-cache-${{ env.DOCKER_IMAGES_KEY }}
+
+