Add GH actions Maven publishing, improve buildscript

.github/workflows/release.yml

@@ -0,0 +1,33 @@
+name: Java Gradle Release
+
+on:
+  push:
+    tags:
+      - 'v\d+.\d+.\d+'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up JDK 8
+        uses: actions/setup-java@v2
+        with:
+          java-version: '8'
+          distribution: 'temurin'
+          cache: gradle
+      - name: Publish with Gradle
+        run: ./gradlew publish
+        env:
+          GITHUB_TOKEN: ${{ Secrets.GITHUB_TOKEN }}
+          BUNNYCDN_TOKEN: ${{ Secrets.BUNNYCDN_TOKEN }}
+          RELEASE: true
+      - name: Cleanup Gradle Cache
+        # Remove some files from the Gradle cache, so they aren't cached by GitHub Actions.
+        # Restoring these files from a GitHub Actions cache might cause problems for future builds.
+        run: |
+          rm -f ~/.gradle/caches/modules-2/modules-2.lock
+          rm -f ~/.gradle/caches/modules-2/gc.properties

.github/workflows/snapshot.yml

@@ -0,0 +1,29 @@
+name: Java Gradle Snapshot
+
+on: ["push", "pull_request"]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up JDK 8
+        uses: actions/setup-java@v2
+        with:
+          java-version: '8'
+          distribution: 'temurin'
+          cache: gradle
+      - name: Publish with Gradle
+        run: ./gradlew publish
+        env:
+          GITHUB_TOKEN: ${{ Secrets.GITHUB_TOKEN }}
+          BUNNYCDN_TOKEN: ${{ Secrets.BUNNYCDN_TOKEN }}
+      - name: Cleanup Gradle Cache
+        # Remove some files from the Gradle cache, so they aren't cached by GitHub Actions.
+        # Restoring these files from a GitHub Actions cache might cause problems for future builds.
+        run: |
+          rm -f ~/.gradle/caches/modules-2/modules-2.lock
+          rm -f ~/.gradle/caches/modules-2/gc.properties