[CI] Add AdHoc release workflow

Adds Github workflow that can be run to handle the release process
if the 'Deploy Artifacts' step fails due to timeout but the repo
is eventually closed or closed manually.

.github/workflows/release-ad-hoc.yml

@@ -0,0 +1,112 @@
+name: Ad Hoc Release
+
+on:
+  push:
+  workflow_dispatch:
+
+env:
+  GCHAT_WEBHOOK_URL: ${{ secrets.SPRING_RELEASE_GCHAT_WEBHOOK_URL }}
+  GRADLE_ENTERPRISE_CACHE_USER: ${{ secrets.GRADLE_ENTERPRISE_CACHE_USER }}
+  GRADLE_ENTERPRISE_CACHE_PASSWORD: ${{ secrets.GRADLE_ENTERPRISE_CACHE_PASSWORD }}
+  GRADLE_ENTERPRISE_ACCESS_KEY: ${{ secrets.GRADLE_ENTERPRISE_SECRET_ACCESS_KEY }}
+  COMMIT_OWNER: ${{ github.event.pusher.name }}
+  COMMIT_SHA: ${{ github.sha }}
+  ARTIFACTORY_USERNAME: ${{ secrets.ARTIFACTORY_USERNAME }}
+  ARTIFACTORY_PASSWORD: ${{ secrets.ARTIFACTORY_PASSWORD }}
+
+jobs:
+  prerequisites:
+    name: Pre-requisites for building
+    runs-on: ubuntu-latest
+    if: github.repository == 'spring-projects/spring-pulsar'
+    outputs:
+      runjobs: ${{ steps.continue.outputs.runjobs }}
+      project_version: ${{ steps.continue.outputs.project_version }}
+      boot_version: ${{ steps.continue.outputs.boot_version }}
+    steps:
+      - uses: actions/checkout@v4
+      - id: continue
+        name: Determine if should continue
+        run: |
+          # Run jobs if in upstream repository
+          echo "runjobs=true" >>$GITHUB_OUTPUT
+          # Extract version from gradle.properties
+          version=$(cat gradle.properties | grep "version=" | awk -F'=' '{print $2}')
+          echo "project_version=$version" >>$GITHUB_OUTPUT
+          bootVersion=$(cat gradle/libs.versions.toml | grep "spring-boot = \"" | cut -d '"' -f2)
+          echo "boot_version=$bootVersion" >>$GITHUB_OUTPUT
+  perform_release:
+    name: Perform Release
+    needs: [prerequisites]
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    timeout-minutes: 120
+    if: ${{ !endsWith(needs.prerequisites.outputs.project_version, '-SNAPSHOT') }}
+    env:
+      REPO: ${{ github.repository }}
+      BRANCH: ${{ github.ref_name }}
+      VERSION: ${{ needs.prerequisites.outputs.project_version }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GH_ACTIONS_REPO_TOKEN }}
+      - uses: spring-io/spring-gradle-build-action@v2
+      - name: Wait for Artifactory artifacts (milestone)
+        if: ${{ contains(needs.prerequisites.outputs.project_version, '-RC') || contains(needs.prerequisites.outputs.project_version, '-M') }}
+        run: |
+          echo "Wait for artifacts of $REPO@$VERSION to appear on Artifactory."
+          until curl -f -s https://repo.spring.io/artifactory/milestone/org/springframework/pulsar/spring-pulsar/$VERSION/ > /dev/null
+          do
+            sleep 30
+            echo "."
+          done
+          echo "Artifacts for $REPO@$VERSION have been released to Artifactory."
+      - name: Wait for Maven Central artifacts (GA)
+        if: ${{ !contains(needs.prerequisites.outputs.project_version, '-SNAPSHOT') && !contains(needs.prerequisites.outputs.project_version, '-RC') && !contains(needs.prerequisites.outputs.project_version, '-M') }}
+        run: |
+          echo "Wait for artifacts of $REPO@$VERSION to appear on Maven Central."
+          until curl -f -s https://repo1.maven.org/maven2/org/springframework/pulsar/spring-pulsar/$VERSION/ > /dev/null
+          do
+            sleep 30
+            echo "."
+          done
+          echo "Artifacts for $REPO@$VERSION have been released to Maven Central."
+      - name: Setup git for release tagging
+        run: |
+          git config user.name 'github-actions[bot]'
+          git config user.email 'github-actions[bot]@users.noreply.github.com'
+      - name: Tag release
+        run: |
+          echo "Tagging $REPO@$VERSION release."
+          git tag v$VERSION
+          git push --tags origin
+      - name: Install tooling for Github release
+        run: |
+          curl -sSL -O https://github.com/spring-io/github-changelog-generator/releases/download/v0.0.10/github-changelog-generator.jar
+      - name: Create Github release
+        env:
+          RELEASE_NOTES_FILE: ${{runner.temp}}/release_notes.md5
+          GH_TOKEN: ${{ secrets.GH_ACTIONS_REPO_TOKEN }}
+        run: |
+          java -jar github-changelog-generator.jar \
+            --spring.config.location=.github/changelog-generator.yml \
+            $VERSION $RELEASE_NOTES_FILE
+          cat $RELEASE_NOTES_FILE
+          gh release create v$VERSION \
+          --draft \
+          --title "Spring Pulsar $VERSION" \
+          --generate-notes \
+          --notes-file $RELEASE_NOTES_FILE
+      - name: Announce Release in Chat
+        uses: julb/action-post-googlechat-message@v1
+        if: env.GCHAT_WEBHOOK_URL
+        with:
+          message: "spring-pulsar-announcing `${{ env.VERSION }}`"
+          gchat_webhook_url: ${{ env.GCHAT_WEBHOOK_URL }}
+      - name: Update next snapshot version
+        run: |
+          echo "Updating $REPO@$VERSION to next snapshot version."
+          ./gradlew :updateToSnapshotVersion
+          git commit -am "[Release $VERSION] Next development version"
+          git push