Add build size verification script

.github/workflows/build.yaml

@@ -24,13 +24,26 @@ jobs:
   waiting_room:
     name: Waiting Room
     runs-on: ubuntu-latest
-    needs: [conda_build, pip_install, npm_build, cdn_build]
+    needs: [conda_build, pip_install, npm_build, cdn_build, verify_sizes]
     if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
     environment:
       name: publish
     steps:
       - run: echo "All builds have finished, have been approved, and ready to publish"
 
+  verify_sizes:
+    name: Verify sizes
+    runs-on: ubuntu-latest
+    needs: [conda_build, pip_build, npm_build, cdn_build]
+    env:
+      - GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}"
+      - RUN_ID: ${{ github.run_id }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+         fetch-depth: "1"
+      - run: pipx run scripts/verify_build_sizes.py $RUN_ID
+
   pixi_lock:
     name: Pixi lock
     runs-on: ubuntu-latest

scripts/verify_build_sizes.py

@@ -0,0 +1,49 @@
+# /// script
+# dependencies = ["requests"]
+# ///
+import os
+import sys
+
+import requests
+
+PACKAGE = "panel"
+
+
+EXPECTED_SIZES_MB = {
+    "npm": 25,
+    "pip": 60,  # sdist + wheel
+    "cdn": 30,
+    "conda": 25,
+}
+
+HEADERS = {
+    "Accept": "application/vnd.github+json",
+    "Authorization": f"Bearer {os.environ['GITHUB_TOKEN']}",
+    "X-GitHub-Api-Version": "2022-11-28",
+}
+
+
+def main(run_number: int):
+    url = f"https://api.github.com/repos/holoviz/{PACKAGE}/actions/workflows/build.yaml/runs"
+    resp = requests.get(url, headers=HEADERS, timeout=20)
+    assert resp.ok
+
+    for run in resp.json()["workflow_runs"]:
+        if run["run_number"] == run_number:
+            break
+
+    assert run["run_number"] == run_number, "Run number not found!"
+
+    artifact_url = run["url"] + "/artifacts"
+    artifact_resp = requests.get(artifact_url, headers=HEADERS, timeout=20)
+    assert artifact_resp.ok
+
+    sizes = {v["name"]: v["size_in_bytes"] for v in artifact_resp.json()["artifacts"]}
+
+    print(sizes)
+    for k, v in EXPECTED_SIZES_MB.items():
+        assert sizes[k] < v * 1024**2, f"{k} artifact ({sizes[k] / 1024**2:0.2f} MB) larger than {v} MB."
+
+
+if __name__ == "__main__":
+    main(int(sys.argv[1]))