ci(header): adds actions to lint and build

Signed-off-by: Kai Henseler <[email protected]>

.github/workflows/header-building.yml

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+name: Header Build and Create Pull Request
+
+on:
+  pull_request:
+    branches:
+      - main
+    paths:
+      - 'IONOS/**'
+      - '!core/js/custom-elements/global-navigation/**'
+
+jobs:
+  build-and-pr:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Set up Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: 20
+
+    - name: Install dependencies
+      run: cd IONOS/ && npm ci
+
+    - name: Run lint
+      run: cd IONOS/ && npm run lint
+
+    - name: Run build
+      run: cd IONOS/ && npm run build
+
+    - name: Create Pull Request
+      uses: peter-evans/create-pull-request@v6
+      with:
+        commit-message: "build(header): auto build header"
+        committer: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
+        author: ${{ github.actor }} <${{ github.actor_id }}>
+        branch: auto-build-${{ github.head_ref }}-output
+        delete-branch: true
+        signoff: true
+        title: "Automated Build: Header for ${{ github.head_ref }}"
+        body: |
+            This pull request was automatically generated by the GitHub Actions workflow to ensure that the custom element IIFE from the 'IONOS/' subdirectory is built and integrated into the main project directory.
+
+            ## Purpose
+            This workflow ensures that the latest changes to the custom element are always built and ready for use, preventing potential issues from unbuilt changes.

.github/workflows/header-linting.yml

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+name: Header Code Quality
+
+on:
+  push:
+    paths:
+      - 'IONOS/**'
+
+jobs:
+  code-quality:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: Install Dependencies
+        run: cd IONOS/ && npm ci
+
+      - name: Lint Headers
+        run: cd IONOS/ && npm run lint
+
+      - name: Prettier
+        run: cd IONOS/ && npm run format:check