remove github CI

.github/workflows/Gradle CI.yml

@@ -1,45 +0,0 @@
-name: Gradle CI
-
-# Controls when the action will run. 
-on:
-  # Triggers the workflow on push and pull request events but only for the master branch
-  push:
-    branches:
-      - master
-  pull_request:
-    branches:
-      - master
-
-  # Allows to run this workflow manually from the Actions tab
-  workflow_dispatch:
-
-jobs:
-
-  build:
-
-    name: Gradle-Build
-    
-    # The type of runner that the job will run on
-    runs-on: ubuntu-20.04
-
-    # Steps represent a sequence of tasks that will be executed as part of the job
-    steps:
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - name: Checkout
-        uses: actions/checkout@v2
-      
-      # Setup JDK
-      - name: Setup Java JDK
-        uses: actions/setup-java@v1.4.3
-        with:
-          java-version: 11
-      
-      # Validate Gradle Wrapper
-      - name: Gradle Wrapper Validation
-        uses: gradle/wrapper-validation-action@v1.0.3
-        
-      # Build
-      - name: Make gradlew executable
-        run: chmod +x ./gradlew
-      - name: Build with Gradle
-        run: ./gradlew build