Add GitHub Actions for Maven setup, JUnit reporting, and build analysis with SonarCloud.

.github/actions/publish-report/action.yml

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+name: Publish JUnit Report (Short Names)
+description: Normalize JUnit XML report names and publish a summary-only test report.
+inputs:
+  token:
+    description: GitHub token for creating the check run.
+    required: true
+  report-name:
+    description: Name shown for the test report.
+    required: false
+    default: Summary of JUnit Tests
+
+runs:
+  using: composite
+  steps:
+    - name: Normalize JUnit report names
+      shell: bash
+      run: |
+        mkdir -p junit-short
+        shopt -s globstar nullglob
+        for f in **/target/*-reports/TEST-*.xml; do
+          base="$(basename "$f")"
+          short="${base#TEST-}"
+          short="${short%.xml}"
+          cp "$f" "junit-short/${short}"
+        done
+
+    - name: Publish Test Report
+      uses: dorny/test-reporter@v2
+      with:
+        token: ${{ inputs.token }}
+        name: ${{ inputs.report-name }}
+        path: "*"
+        reporter: java-junit
+        only-summary: true
+        working-directory: "junit-short"

.github/actions/setup-java-maven/action.yml

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+name: "Setup Maven with GitHub Packages"
+
+description: "Sets up JDK, caches Maven dependencies, and configures GitHub Packages for Maven repositories."
+
+inputs:
+  java-version:
+    description: "Java version to install"
+    default: "17"
+    required: true
+  java-distribution:
+    description: "Java distribution to use"
+    default: "corretto"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Set up JDK
+      uses: actions/setup-java@v4
+      with:
+        distribution: ${{ inputs.java-distribution }}
+        java-version: ${{ inputs.java-version }}
+
+    - name: Cache Maven Repository
+      uses: actions/cache@v4
+      with:
+        path: ~/.m2/repository
+        key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+        restore-keys: |
+          ${{ runner.os }}-maven-      
+
+    - name: Set up Maven with GitHub Packages
+      run: |
+        echo "<settings>
+          <servers>
+            <server>
+              <id>github-cloudflaredns</id>
+              <username>th-schwarz</username>
+              <password>${{ secrets.GITHUB_TOKEN }}</password>
+            </server>
+          </servers>
+        </settings>" > ~/.m2/settings.xml
+      shell:
+        bash