add new release workflow

.github/workflows/release.yml

@@ -0,0 +1,35 @@
+name: Release
+on:
+  milestone:
+    types: [closed]
+jobs:
+  build:
+    name: Release ${{ github.event.milestone.title }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          ref: master
+          fetch-depth: 0
+      - name: Set up Git
+        run: |
+          git config user.name "Zonky Bot"
+          git config user.email "[email protected]"
+      - name: Set up JDK
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'zulu'
+          java-version: 8
+          server-id: ossrh
+          server-username: MAVEN_USER
+          server-password: MAVEN_PASS
+          gpg-private-key: ${{ secrets.SIGNING_CERT }}
+          gpg-passphrase: SIGNING_PASS
+      - name: Release with Maven
+        env:
+          RELEASE_VERSION: ${{ github.event.milestone.title }}
+          MAVEN_USER: ${{ secrets.MAVEN_USER }}
+          MAVEN_PASS: ${{ secrets.MAVEN_PASS }}
+          SIGNING_PASS: ${{ secrets.SIGNING_PASS }}
+        run: mvn -B release:prepare release:perform -DreleaseVersion=$RELEASE_VERSION

.github/workflows/maven.yml → .github/workflows/test.yml

@@ -1,4 +1,4 @@
-name: Java CI
+name: Checks
 on: [push, pull_request]
 jobs:
   build:
@@ -9,17 +9,12 @@ jobs:
         java: [8, 11, 13, 14, 15]
     steps:
     - name: Checkout project
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2
     - name: Set up JDK
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v2
       with:
+        distribution: 'zulu'
         java-version: ${{ matrix.java }}
-    - name: Cache Maven repository
-      uses: actions/cache@v1
-      with:
-        path: ~/.m2/repository
-        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
-        restore-keys: |
-          ${{ runner.os }}-maven-
+        cache: 'maven'
     - name: Build with Maven
       run: mvn -B test