Activate github actions

Author: jjohannes

.github/workflows/build.yaml

@@ -0,0 +1,18 @@
+name: Build Plugin
+on: [ push, pull_request ]
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: true
+      matrix:
+        jdk: [ 11 ]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-java@v2
+        with:
+          java-version: ${{ matrix.jdk }}
+          distribution: temurin
+      - uses: eskatos/gradle-command-action@v1
+        with:
+          arguments: :build