ci: publish workflow

.github/workflows/publish.yml

@@ -0,0 +1,45 @@
+# References:
+#  - https://docs.github.com/en/actions/use-cases-and-examples/publishing-packages/publishing-java-packages-with-maven
+
+name: "Publish to Maven Central"
+
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  publish-to-maven-central:
+    runs-on: ubuntu-latest
+    name: Publish to Maven Central
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+      - uses: actions/setup-java@v4
+        with:
+          distribution: adopt
+          java-version: 21
+          server-id: central
+          server-username: MAVEN_USERNAME
+          server-password: MAVEN_PASSWORD
+
+      - id: install-secret-key
+        name: Install gpg secret key
+        run: |
+          # Install gpg secret key
+          cat <(echo -e "${{ secrets.OSSRH_GPG_SECRET_KEY }}") | gpg --batch --import
+          # Verify gpg secret key
+          gpg --list-secret-keys --keyid-format LONG
+      - id: publish-to-central
+        name: Publish to Central Repository
+        env:
+          MAVEN_USERNAME: ${{ vars.OSSRH_USERNAME }}
+          MAVEN_PASSWORD: ${{ secrets.OSSRH_TOKEN }}
+        run: |
+          mvn \
+            --no-transfer-progress \
+            --batch-mode \
+            -Dgpg.passphrase=${{ secrets.OSSRH_GPG_SECRET_KEY_PASSWORD }} \
+            clean deploy -P release

pom.xml

@@ -181,6 +181,16 @@
   <build>
     <finalName>flagsmith-java-client-${project.version}</finalName>
     <plugins>
+      <plugin>
+        <groupId>org.sonatype.central</groupId>
+        <artifactId>central-publishing-maven-plugin</artifactId>
+        <version>0.6.0</version>
+        <extensions>true</extensions>
+        <configuration>
+          <publishingServerId>central</publishingServerId>
+          <autoPublish>true</autoPublish>
+        </configuration>
+      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>