added new gha config. run test, build and push gem to gpr in one action.

Author: d-hrs

.github/workflows/main.yml

@@ -0,0 +1,51 @@
+name: main
+
+on:
+  push:
+    branches:
+      - 'main'
+    tags:
+      - '*'
+  pull_request:
+    branches:
+      - 'main'
+    types: [opened, synchronize]
+  pull_request_target:
+    branches:
+      - 'main'
+    types: [labeled]
+
+jobs:
+  test:
+    name: test
+    runs-on: ubuntu-latest
+    if: >
+      ${{
+        github.event_name == 'pull_request' ||
+        github.event_name == 'workflow_dispatch' ||
+        (github.event_name == 'pull_request_target' && contains(github.event.pull_request.labels.*.name, 'safe to test')) ||
+        startsWith(github.ref, 'refs/tags/')
+      }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up JDK 1.8
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Test
+        run: ./gradlew test
+  build:
+    name: Build + Publish
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+    needs: [ test ]
+    if: ${{ github.event_name == 'workflow_dispatch' || contains(github.ref, 'refs/tags/') }}
+    steps:
+      - name: push gem
+        uses: trocco-io/push-gem-to-gpr-action@v1
+        with:
+          language: java
+          gem-path: "./build/gems/*.gem"
+          github-token: "${{ secrets.GITHUB_TOKEN }}"