Support pinning a custom-component branch/ref in CI

.github/workflows/ha_check.yaml

@@ -86,8 +86,9 @@ jobs:
               domain = dep["domain"]
               name = dep.get("name", domain)
               owner_repo = repo.rstrip("/").removeprefix("https://github.com/")
-              url = f"https://github.com/{owner_repo}/archive/refs/heads/main.tar.gz"
-              print(f"Installing {name} ({domain}) from {repo}")
+              ref = dep.get("ref", "main")
+              url = f"https://github.com/{owner_repo}/archive/refs/heads/{ref}.tar.gz"
+              print(f"Installing {name} ({domain}) from {repo}@{ref}")
               with tempfile.TemporaryDirectory() as tmp:
                   archive = os.path.join(tmp, "component.tar.gz")
                   urllib.request.urlretrieve(url, archive)

tests/custom_components.yaml

@@ -15,6 +15,11 @@ dependencies:
   - name: Template Climate
     domain: climate_template
     repository: https://github.com/mikopp/hass-template-climate
+    # Optional: branch to install from (defaults to "main" if omitted).
+    # Lets CI validate this config against an unmerged hass-template-climate
+    # branch/PR before it lands on main — set it temporarily on a throwaway
+    # branch, never on master.
+    # ref: some-branch-to-validate
     hacs: mikopp/hass-template-climate
     description: >
       Provides the climate_template platform used in packages/climate_airflow.yaml