ci: Migrate to new publishing flow, allowing for snapshots and releas…

…e using actions

.github/workflows/build-pullrequest.yml

@@ -0,0 +1,31 @@
+name: Build pull request
+
+on:
+  pull_request:
+    branches: [ master ]
+permissions:
+  contents: read
+
+jobs:
+  build-java:
+    if: "!contains(github.event.head_commit.message, 'ci skip')"
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3.0.0
+        with:
+          fetch-depth: 0
+          submodules: 'recursive'
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'zulu'
+          java-version: '17'
+
+      - name: Setup Gradle
+        uses: gradle/gradle-build-action@v2
+
+      - name: Build & test Java code
+        run: |
+          ./gradlew build
+          ./gradlew test

.github/workflows/main.yml

@@ -0,0 +1,52 @@
+name: Build and deploy
+
+on:
+  push:
+    branches: [ master ]
+  release:
+    types: [ published ]
+
+env:
+  GRADLE_USER_HOME: .gradle
+
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: 'recursive'
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Setup Gradle
+        uses: gradle/gradle-build-action@v2
+      - name: Build with Gradle
+        run: ./gradlew build
+      - name: Upload all output libs
+        uses: actions/upload-artifact@v3.0.0
+        with:
+          name: output-libs
+          path: "*/build/libs"
+
+      - name: Snapshot build deploy
+        if: github.event_name == 'push' && github.ref == 'refs/heads/master' && github.repository_owner == 'libgdx'
+        run: ./gradlew build publish
+        env:
+          ORG_GRADLE_PROJECT_NEXUS_USERNAME: ${{ secrets.NEXUS_USERNAME }}
+          ORG_GRADLE_PROJECT_NEXUS_PASSWORD: ${{ secrets.NEXUS_PASSWORD }}
+
+      - name: Import GPG key
+        if: github.event_name == 'release' && github.repository_owner == 'libgdx'
+        id: import_gpg
+        uses: crazy-max/ghaction-import-gpg@1c6a9e9d3594f2d743f1b1dd7669ab0dfdffa922
+        with:
+          gpg-private-key: ${{ secrets.GPG_PRIVATE_KEY }}
+          passphrase: ${{ secrets.GPG_PASSPHRASE }}
+      - name: Release build deploy
+        if: github.event_name == 'release' && github.repository_owner == 'libgdx'
+        run: ./gradlew build publish -PRELEASE -Psigning.gnupg.keyId=${{ secrets.GPG_KEYID }} -Psigning.gnupg.passphrase=${{ secrets.GPG_PASSPHRASE }} -Psigning.gnupg.keyName=${{ secrets.GPG_KEYID }}
+        env:
+          ORG_GRADLE_PROJECT_NEXUS_USERNAME: ${{ secrets.NEXUS_USERNAME }}
+          ORG_GRADLE_PROJECT_NEXUS_PASSWORD: ${{ secrets.NEXUS_PASSWORD }}