feat: Add snapshot publish workflow

.github/workflows/gradle-publish-snapshot.yml

@@ -0,0 +1,40 @@
+# SPDX-FileCopyrightText: 2024 Deutsche Telekom AG
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: Gradle Publish Snapshot
+on:
+  workflow_run:
+    workflows:
+      - "Gradle Build and Test"
+    types:
+      - completed
+    branches-ignore:
+      - 'main'
+      - 'master'
+      - 'develop'
+jobs:
+  gradle-publish:
+    runs-on: ubuntu-latest
+
+    services:
+      docker:
+        image: docker:25-dind
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v3
+
+      - name: Execute Gradle publish
+        env:
+          PUBLISH_USERNAME: ${{ secrets.PUBLISH_USERNAME }}
+          PUBLISH_PASSWORD: ${{ secrets.PUBLISH_PASSWORD }}
+          PUBLISH_GPG_PRIVATE_KEY: ${{ secrets.PUBLISH_GPG_PRIVATE_KEY }}
+          PUBLISH_GPG_PASSPHRASE: ${{ secrets.PUBLISH_GPG_PASSPHRASE }}
+        run: ./gradlew -Pversion=0.0.0-SNAPSHOT-${{GITHUB_RUN_ID}} publish