Add tag based CD trigger

.github/workflows/cd.yml

@@ -0,0 +1,29 @@
+name: Publish Custom App
+
+on:
+  release:
+    types: [published]
+    branches:
+      - main
+
+jobs:
+  publish:
+    runs-on: macos-13
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          path: custom
+      
+      - name: Set tag variable as an output
+        id: vars
+        run: 
+          |
+          echo "tag=${GITHUB_REF#refs/*/}" >> $GITHUB_OUTPUT
+
+      - name: Validate tag
+        run:
+          |
+          cd custom
+          python .github/workflows/tag_validator.py ${{ steps.vars.outputs.tag }}

.github/workflows/tag_validator.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+
+import argparse
+import re
+from pathlib import Path
+import sys
+
+
+def is_valid(tag):
+    # Regex verify the tag format
+    pattern = re.compile(
+        r'^(?P<brand_folder>\w+)_(?P<build_nr>\d+)(?:_(?P<extra_tag>\w+))?$')
+    match = pattern.match(tag)
+
+    if match:
+        groups = match.groupdict()
+        brand = groups.get('brand_folder')
+        build_nr = int(groups.get('build_nr'))
+        if Path(brand).is_dir():
+            print(f"valid tag found: {tag} (brand: {
+                  brand}, build number: {build_nr})")
+            return True
+        else:
+            exist_with_error(f"The directory of the tag: '{
+                             brand}' doesn't exist")
+    else:
+        exist_with_error(f"Invalid tag: {tag}")
+        return False
+
+
+def exist_with_error(msg):
+    print(f"Error: {msg}")
+    sys.exit(1)
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="A github tag validator for custom apps")
+    parser.add_argument(
+        "tag",
+        help="The github tag to be verified",
+        type=str
+    )
+    args = parser.parse_args()
+    return is_valid(args.tag)
+
+
+if __name__ == "__main__":
+    main()