feat: add maven deploy snapshot workflow

Author: BernhardFuchs

.github/workflows/deploy-snapshot.yml

@@ -0,0 +1,23 @@
+name: Deploy snapshot to Danubetech Nexus
+
+on:
+  push:
+    paths-ignore:
+      - '.gitignore'
+      - 'README.md'
+      - 'LICENSE'
+    branches-ignore:
+      - 'release-**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@master
+      - name: Run maven deploy action
+        uses: danubetech/github-action-maven-deploy@master
+        with:
+          server_id: danubetech-maven-snapshots
+        env:
+          MAVEN_USERNAME: ${{ secrets.MAVEN_USERNAME }}
+          MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}