Configure snapshot publish

- New workflow which can be run manually to test publish.
- Relates #328

.github/workflows/ci-publish.yml

@@ -0,0 +1,38 @@
+name: CI Publish
+
+on:
+  workflow_dispatch:
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    name: CI Publish
+    steps:
+    - uses: actions/checkout@v2
+    - uses: jvalkeal/setup-maven@v1
+      with:
+        maven-version: 3.8.4
+    - uses: actions/setup-java@v2
+      with:
+        distribution: adopt
+        java-version: 8
+    - uses: jfrog/setup-jfrog-cli@v1
+      with:
+        version: 1.46.4
+      env:
+        JF_ARTIFACTORY_SPRING: ${{ secrets.JF_ARTIFACTORY_SPRING }}
+    - name: Configure JFrog Cli
+      run: |
+        jfrog rt mvnc \
+          --server-id-resolve=repo.spring.io \
+          --server-id-deploy=repo.spring.io \
+          --repo-resolve-releases=libs-milestone \
+          --repo-resolve-snapshots=libs-snapshot \
+          --repo-deploy-releases=release \
+          --repo-deploy-snapshots=snapshot
+        echo JFROG_CLI_BUILD_NAME=spring-shell-main >> $GITHUB_ENV
+        echo JFROG_CLI_BUILD_NUMBER=$GITHUB_RUN_NUMBER >> $GITHUB_ENV
+    - name: Build and Publish
+      run: |
+        jfrog rt mvn -B clean install
+        jfrog rt build-publish