feat: add release action

.github/project.yml

@@ -0,0 +1,3 @@
+release:
+  current-version: 0.0.6
+  next-version: 0.0.7-SNAPSHOT

.github/workflows/release.yml

@@ -0,0 +1,77 @@
+name: Java Buildpack Client Release
+
+on:
+  pull_request:
+    types: [closed]
+    paths:
+      - '.github/project.yml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    name: release
+    if: ${{github.event.pull_request.merged == true}}
+
+    steps:
+      - uses: radcortez/project-metadata-action@main
+        name: Retrieve project metadata
+        id: metadata
+        with:
+          github-token: ${{secrets.GITHUB_TOKEN}}
+          metadata-file-path: '.github/project.yml'
+
+      - uses: actions/checkout@v4
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 17
+          cache: 'maven'
+          server-id: ossrh
+          server-username: OSS_SONATYPE_USERNAME
+          server-password: OSS_SONATYPE_PASSWORD
+          gpg-private-key: ${{ secrets.GPG_PRIVATE_KEY }}
+          gpg-passphrase: MAVEN_GPG_PASSPHRASE
+
+      - name: Configure Git author
+        run: |
+          git config --local user.email "[email protected]"
+          git config --local user.name "GitHub Action"
+      - name: Set release version in the samples and readme
+        run: |
+          find ./samples/ -iwholename "*/pack.java" | while read f; do
+            sed -i "s/dev.snowdrop:buildpack-client:.*/dev.snowdrop:buildpack-client:${{steps.metadata.outputs.current-version}}\}/g" $f
+            git add $f
+          done
+          sed -i "s/dev.snowdrop:buildpack-client:.*/dev.snowdrop:buildpack-client:${{steps.metadata.outputs.current-version}}\}/g" README.md
+          sed -i "s/<version>.*<\/version>/<version>${{steps.metadata.outputs.current-version}}<\/version>/g" README.md
+          git add README.md
+          git commit -m "chore: set release version: ${{steps.metadata.outputs.current-version}} in samples and README.md"
+      - name: Maven release ${{steps.metadata.outputs.current-version}}
+        run: |
+          mvn -B release:prepare -Prelease -DreleaseVersion=${{steps.metadata.outputs.current-version}} -DdevelopmentVersion=${{steps.metadata.outputs.next-version}}
+          mvn -B release:perform -Darguments=-DperformRelease -DperformRelease -Prelease
+        env:
+          OSS_SONATYPE_USERNAME: ${{ secrets.OSS_SONATYPE_USERNAME }}
+          OSS_SONATYPE_PASSWORD: ${{ secrets.OSS_SONATYPE_PASSWORD }}
+          MAVEN_GPG_PASSPHRASE: ${{ secrets.GPG_PASSPHRASE }}
+      - name: Set dev version in the samples and readme
+        run: |
+          find ./samples/ -iwholename "*/pack.java" | while read f; do
+            sed -i "s/dev.snowdrop:buildpack-client:.*/dev.snowdrop:buildpack-client:${{steps.metadata.outputs.next-version}}\}/g" $f
+            git add $f
+          done
+          git commit -m "chore: set dev version: ${{steps.metadata.outputs.next-version}} in samples and README.md"
+      - name: Push changes to ${{github.base_ref}} branch
+        run: |
+          git push
+          git push origin ${{steps.metadata.outputs.current-version}}