project: GitHub actions (#1577)

.github/workflows/gradle.yml

@@ -0,0 +1,23 @@
+name: RunelitePlus continuous integration
+
+on: [pull_request, push]
+
+jobs:
+  build:
+
+    runs-on: windows-latest
+
+    steps:
+      - uses: actions/checkout@v1
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+      - name: Assembling
+        run: gradlew assemble --console=plain
+      - name: Building
+        run: gradlew build --stacktrace -x test -x checkstyleMain --console=plain
+      - name: Testing
+        run: gradlew test --stacktrace --console=plain
+      - name: Checking code conventions
+        run: gradlew checkstyleMain --console=plain