Add header confirmation CI

.github/workflows/header-confirm.yaml

@@ -0,0 +1,20 @@
+name: Header Confirmation
+
+on:
+  push:
+    branches:
+      - main
+  pull_request: {}
+
+jobs:
+  header-confirm:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+      - name: Install dependencies
+        run: pip install python-frontmatter
+      - name: Confirm headers
+        run: python optunahub-registry/header_confirm.py        

optunahub-registry/header_confirm.py

@@ -0,0 +1,24 @@
+import os
+
+import frontmatter
+
+
+def header_confirm(path: str) -> None:
+    post = frontmatter.load(path)
+    assert "author" in post.keys(), f"author is not found in {path}"
+    assert "title" in post.keys(), f"title is not found in {path}"
+    assert "description" in post.keys(), f"description is not found in {path}"
+    assert "tags" in post.keys(), f"tags is not found in {path}"
+    assert "optuna_versions" in post.keys(), f"optuna_versions is not found in {path}"
+    assert "license" in post.keys(), f"license is not found in {path}"
+
+
+if __name__ == "__main__":
+    # Check all README files under the `package` directory.
+    for root, dirs, files in os.walk("package"):
+        for file in files:
+            if file == "README.md":
+                header_confirm(os.path.join(root, file))
+
+    # Check the template file.
+    header_confirm("template/README.md")