Update snapshot workflow to work with maven

Signed-off-by: Heiko Kiesel <heiko.kiesel@iteratec.com>

Author: Heiko Kiesel

.github/workflows/snapshot.yml

@@ -3,8 +3,8 @@
 # SPDX-License-Identifier: Apache-2.0
 
 # This workflow will publish a Java project with Gradle
-# For gradle wrapper validation see: https://github.com/marketplace/actions/gradle-wrapper-validation
-# For gradle build see: https://github.com/marketplace/actions/gradle-build-action
+# For maven build see: https://github.com/marketplace/actions/gradle-build-action
+# For maven publishing see: https://docs.github.com/en/actions/publishing-packages/publishing-java-packages-with-maven
 
 name: Publish Snapshot
 
@@ -17,25 +17,20 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
 
-    - name: Checkout repository
-      uses: actions/checkout@v3
-      with:
-        fetch-depth: 0
-
-    - name: Set up JDK 17
-      uses: actions/setup-java@v3
-      with:
-        java-version: 17
-        distribution: adopt
-
-    - name: Validate Gradle wrapper
-      uses: gradle/wrapper-validation-action@v1.1.0
-
-    - name: Setup Gradle
-      uses: gradle/gradle-build-action@v2.7.0
-
-    - name: Publish to Maven Central
-      run: ./gradlew publish
-      env:
-        MAVEN_USERNAME: ${{ secrets.MAVEN_USERNAME }}
-        MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v3
+        with:
+          java-version: 17
+          distribution: temurin
+          server-id: ossrh
+          server-username: MAVEN_USERNAME
+          server-password: MAVEN_PASSWORD
+
+      - name: Build & Publish to Maven Central
+        run: mvn -U -B clean deploy # -U: force updates for dependencies, -B: no user input
+        env:
+          MAVEN_USERNAME: ${{ secrets.MAVEN_USERNAME }}
+          MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}