add github actions

.github/FUNDING.yml

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+github: [Haehnchen]
+custom: https://www.paypal.me/DanielEspendiller

.github/workflows/gradle.yml

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+# This workflow will build a Java project with Gradle
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
+
+name: Java CI with Gradle
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repository and submodules
+      uses: actions/checkout@v3
+      with:
+        submodules: recursive
+
+    - name: Set up JDK 17
+      uses: actions/setup-java@v2
+      with:
+        java-version: '17'
+        distribution: 'adopt'
+
+    # Cache Gradle dependencies
+    - name: Setup Gradle Dependencies Cache
+      uses: actions/cache@v3
+      with:
+        path: ~/.gradle/caches
+        key: ${{ runner.os }}-v2-gradle-caches-${{ hashFiles('**/*.gradle', '**/*.gradle.kts', 'gradle.properties') }}
+
+    # Cache Gradle Wrapper
+    - name: Setup Gradle Wrapper Cache
+      uses: actions/cache@v3
+      with:
+        path: ~/.gradle/wrapper
+        key: ${{ runner.os }}-v2-gradle-wrapper-${{ hashFiles('**/gradle/wrapper/gradle-wrapper.properties') }}
+
+    - name: Grant execute permission for gradlew
+      run: chmod +x gradlew
+
+    - name: Build with Gradle
+      run: export ./gradlew check verifyPlugin buildPlugin