chore: Add Maven Central publishing workflow for GitHub Actions

.github/workflows/publish-to-central-snapshots.yml

@@ -2,6 +2,11 @@
 name: Publish to Maven Central Snapshots
 on:
   workflow_dispatch:
+    inputs:
+      perform-a-gradle-clean:
+        description: "Perform a Gradle clean"
+        type: boolean
+        default: false
 jobs:
   build:
     runs-on: [ self-hosted, Android ]
@@ -15,6 +20,9 @@ jobs:
           java-version: 21
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v5
+      - name: Perform a Gradle clean, as requested
+        if: ${{ github.event.inputs.perform-a-gradle-clean == 'true' }}
+        run: ./gradlew clean
       - name: Publish the snapshots
         run: ./gradlew publishAggregationToCentralSnapshots
 env:

.github/workflows/publish-to-maven-central.yml

@@ -0,0 +1,43 @@
+# https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions
+name: Publish to Maven Central
+on:
+  workflow_dispatch:
+    inputs:
+      acknowledgement:
+        description: |
+          WARNING: Publishing a version to Maven Central is irrevocable.
+          Do you confirm (Yes/no):
+          1. You have successfully tested publishing snapshot (with a Gradle CLEAN) just before changing the version
+          2. The version is CORRECT, and is NOT a SNAPSHOT
+          3. The iOS release has already been published
+          4. You are pointing this workflow run to the tag that matches the version
+          5. You are not drunk or otherwise too tired
+        required: true
+        type: string
+
+jobs:
+  build:
+    runs-on: [ self-hosted, Android ]
+    steps:
+      - name: Check acknowledgement
+        run: test "${{ github.event.inputs.acknowledgement }}" = "Yes" || (echo "Acknowledgement missing" && exit 1)
+      - name: Checkout sources
+        uses: actions/checkout@v6
+      - name: Setup Java
+        uses: actions/setup-java@v5
+        with:
+          distribution: 'temurin'
+          java-version: 21
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v5
+      - name: Perform a Gradle clean
+        run: ./gradlew clean
+      - name: Publish the artifacts
+        run: ./gradlew publishAggregationToCentralPortal
+env:
+  GRADLE_OPTS: -Dorg.gradle.jvmargs="-Xmx5g -Dfile.encoding=UTF-8"
+  ossrhUsername: ${{ secrets.SONATYPE_USERNAME }}
+  ossrhPassword: ${{ secrets.SONATYPE_PASSWORD }}
+  GPG_key_id: ${{ secrets.GPG_KEY_ID }}
+  GPG_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
+  GPG_private_password: ${{ secrets.GPG_PRIVATE_PASSWORD }}