chore(ci): add MegaLinter workflow for code quality

- Add GitHub Action workflow with MegaLinter for automated validation
- Configure specific linters:
  - YAML_PRETTIER for YAML formatting
  - KUBERNETES_HELM for Helm chart validation
  - KUBERNETES_KUBESCAPE for security scanning
  - KUBERNETES_KUBECONFORM for K8s manifest validation
  - SPELL_PROSELINT for prose linting
  - JSON_JSONLINT for JSON validation
  - MARKDOWN_MARKDOWNLINT for documentation

- Set up artifact upload for linter reports
- Exclude Chart.yaml and templates from YAML formatting

.github/workflows/linter.yml

@@ -0,0 +1,39 @@
+name: Lint Code Base
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - v*
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  lint:
+    name: Lint Code Base
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: MegaLinter
+        uses: oxsecurity/megalinter@v7
+        env:
+          VALIDATE_ALL_CODEBASE: true
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          ENABLE_LINTERS: YAML_PRETTIER,KUBERNETES_HELM,KUBERNETES_KUBESCAPE,KUBERNETES_KUBECONFORM,SPELL_PROSELINT,JSON_JSONLINT,MARKDOWN_MARKDOWNLINT
+          YAML_PRETTIER_FILTER_REGEX_EXCLUDE: .*(Chart\.yaml|templates/.*).*
+      - name: Archive MegaLinter reports
+        if: success() || failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: MegaLinter reports
+          path: |
+            megalinter-reports
+            mega-linter.log