Add manual workflow to trigger release

Author: Stefan Kapferer

.github/workflows/release-trigger.yml

@@ -0,0 +1,38 @@
+name: Context Mapper Release Trigger
+
+on:
+  workflow_dispatch:
+
+jobs:
+  prepare_release:
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+    - name: Set up JDK 11
+      uses: actions/setup-java@v1
+      with:
+        java-version: 11
+        server-id: github
+    - name: Configure Git user
+      run: |
+        git config user.email "actions@github.com"
+        git config user.name "GitHub Actions"
+    - name: Install Graphviz
+      run: sudo apt-get -y install graphviz
+    - name: Cache local Maven repository
+      uses: actions/cache@v2
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-maven-
+    - name: Grant execute permission for mvnw
+      run: chmod +x mvnw
+    - name: Prepare Release
+      run: ./mvnw --settings ./.github/workflows/settings.xml clean release:prepare -B
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+

.github/workflows/settings.xml

@@ -6,8 +6,8 @@
 	<servers>
 		<server>
 			<id>github</id>
-			<username>${env.GITHUB_USERNAME}</username>
-			<password>${env.GITHUB_PASSWORD}</password>
+			<username>stefan-ka</username>
+			<password>${env.GITHUB_TOKEN}</password>
 		</server>
 	</servers>
 	<profiles>