Adding header check action

.github/workflows/header.yml

@@ -0,0 +1,17 @@
+name: header
+on: [push]
+jobs:
+  check-header:
+    runs-on: ubuntu-latest
+    steps:
+      - name: git clone
+        uses: actions/checkout@v4
+
+      - name: set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: check header in .py files
+        run: |
+          python .nextmv/check_header.py

.nextmv/check_header.py

@@ -0,0 +1,27 @@
+# Description: This script checks if the header is present in all go files.
+import glob
+import sys
+
+HEADER = "// © 2019-present nextmv.io inc"
+
+# List all go files in all subdirectories
+go_files = glob.glob("**/*.go", recursive=True)
+
+# Check if the header is the first line of each file
+missing = []
+checked = 0
+for file in go_files:
+    with open(file, "r") as f:
+        first_line = f.readline().strip()
+        if first_line != HEADER:
+            missing.append(file)
+        checked += 1
+
+# Print the results
+if missing:
+    print(f"Missing header in {len(missing)} of {checked} files:")
+    for file in missing:
+        print(f"  {file}")
+    sys.exit(1)
+else:
+    print(f"Header is present in all {checked} files")