Add release workflow

Author: robinst

.github/workflows/release.yml

@@ -0,0 +1,42 @@
+# See:
+# https://docs.github.com/en/actions/publishing-packages/publishing-java-packages-with-maven
+# https://central.sonatype.org/pages/apache-maven.html
+# https://github.com/actions/setup-java
+
+name: release
+
+on:
+  workflow_dispatch:
+
+jobs:
+  release:
+    environment: maven_central
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+
+      - name: Set up Maven Central repository
+        uses: actions/setup-java@v3
+        with:
+          java-version: '11'
+          distribution: 'temurin'
+          server-id: ossrh
+          server-username: MAVEN_USERNAME # env variable to use for username in release
+          server-password: MAVEN_PASSWORD # env variable to use for password in release
+          gpg-private-key: ${{ secrets.MAVEN_GPG_PRIVATE_KEY }}
+          gpg-passphrase: MAVEN_GPG_PASSPHRASE # env variable to use for passphrase in release
+
+      - name: Set up Git user
+        run: |
+          git config --global user.name "${{ secrets.GIT_USER_NAME }}"
+          git config --global user.email "${{ secrets.GIT_USER_EMAIL }}"
+
+      - name: Release
+        run: |
+          mvn -B release:prepare release:perform
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          MAVEN_USERNAME: ${{ secrets.OSSRH_USERNAME }}
+          MAVEN_PASSWORD: ${{ secrets.OSSRH_PASSWORD }}
+          MAVEN_GPG_PASSPHRASE: ${{ secrets.MAVEN_GPG_PASSPHRASE }}