ci: setup github actions for continuous integration

resolves openequella#26

Author: ChristianMurphy

.github/workflows/ci.yaml

@@ -0,0 +1,24 @@
+name: openEQUELLA-toolbox CI
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - "**"
+  pull_request:
+    branches:
+      - master
+
+jobs:
+  build_and_check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+      - name: Setup Java
+        uses: actions/setup-java@v1
+        with:
+          java-version: 1.8
+      - name: Build and Check
+        run: ./gradlew build check