ci: setup CI workflow with github actions

.github/workflows/ci.yml

@@ -0,0 +1,60 @@
+name: CI
+
+on: [ pull_request, push ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [ 8, 11 ]
+    name: test jdk ${{ matrix.java }}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: ${{ matrix.java }}
+      - name: Cache Gradle packages
+        uses: actions/cache@v2
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          restore-keys: ${{ runner.os }}-gradle
+      - name: Build
+        run: ./gradlew build
+
+  webui:
+    runs-on: ubuntu-latest
+    name: test webui builds
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 8
+      - name: Cache Gradle packages
+        uses: actions/cache@v2
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          restore-keys: ${{ runner.os }}-gradle
+      - name: npmBuild
+        run: ./gradlew npmBuild
+
+  release:
+    name: semantic release
+    runs-on: ubuntu-latest
+    needs: [ test, webui ]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: 13.x
+      - uses: actions/setup-java@v1
+        with:
+          java-version: 8
+      - name: Install dependencies
+        run: npm install --only=production
+      - name: Release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: npx semantic-release