Setup Github Automations

- dependabot for main and release-3 branch
- PR builds for main and release-3 branch

Signed-off-by: Karsten Schnitter <k.schnitter@sap.com>

Author: KarstenSchnitter

.github/dependabot.yml

@@ -0,0 +1,19 @@
+version: 2
+updates:
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: "hourly"
+    target-branch: "main"
+    labels:
+      - "dependencies"
+      - "main-branch"
+    open-pull-requests-limit: 10
+  - package-ecosystem: "maven"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    target-branch: "release-3"
+    labels:
+      - "dependencies"
+      - "release-3"

.github/workflows/maven-verify.yml

@@ -0,0 +1,37 @@
+---
+name: Maven Verify
+
+on:
+  pull_request:
+    branches:
+      - main
+      - release-3
+
+jobs:
+  build-main:
+    if: github.base_ref == 'release-3'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK 11
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '11'
+      - name: Clean with Maven
+        run: mvn clean
+      - name: Build with Maven
+        run: mvn verify
+
+  build-release-4:
+    if: github.base_ref == 'main'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+      - name: Build with Maven
+        run: mvn clean verify