feat(ci): add MegaLinter GitHub Action for Java projects

Added a GitHub Action workflow to integrate MegaLinter for Java code linting.
The action runs on every push to the `main` branch and on pull requests,
ensuring code quality through linting and archiving linting reports.

Author: negadras

.github/workflows/mega-linter.yml

@@ -0,0 +1,48 @@
+---
+# MegaLinter GitHub Action configuration file
+# More info at https://megalinter.io/latest/install-github/
+name: MegaLinter
+
+permissions: read-all
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+jobs:
+  megalinter:
+    name: MegaLinter
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Setup Java
+        uses: actions/setup-java@v3
+        with:
+          java-version: 21
+          distribution: corretto
+
+      - name: MegaLinter
+        uses: oxsecurity/megalinter/flavors/[email protected]
+        env:
+          VALIDATE_ALL_CODEBASE: true
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Archive production artifacts
+        if: success() || failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: MegaLinter reports
+          path: |
+            megalinter-reports
+            mega-linter.log