Starting github actions

- Created github action for gradle build
- contains same as jenkins build but without 
  security scan and documentation

On behalf of Daimler TSS GmbH.

.github/workflows/gradle.yml

@@ -0,0 +1,25 @@
+name: Java and GO CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Set up JDK 1.8
+      uses: actions/setup-java@v1
+      with:
+        java-version: 1.8
+    - name: Build CLI
+      run: ./gradlew clean ensureLocalhostCertificate build -x :sechub-integrationtest:test -x :sechub-cli:build
+    - name: Set up Go
+      uses: actions/setup-go@v1
+      with:
+        go-version: '1.13.1'
+    - name: Build Server
+      run: ./gradlew :sechub-cli:buildGo :sechub-cli:testGo
+    - name: Integration test
+      run: ./gradlew integrationtest