fix: correct LAST_DEPLOYED_SHA detection so Play Store always gets updated (#364)

Closes #361

Three bugs in the hourly deploy workflow's change-detection logic caused the Play Store to silently fall behind whenever a deploy failed or all-android jobs were skipped.

**Bug 1 (primary): commit_sha → head_sha**
Forgejo's API returns head_sha; commit_sha was always None. This meant LAST_DEPLOYED_SHA was always empty, so the diff fell back to HEAD~1..HEAD — only the single most recent commit was inspected. If android changes landed in an earlier commit, they were silently missed.

**Bug 2: Skipped runs counted as 'deployed'**
A workflow run where deploy-playstore was skipped (android=false) has status=success, so it was treated as a successful deploy. Now the code queries each run's job results and only trusts a run where the 'Build & Deploy to Play Store' job's own conclusion=success.

**Bug 3: Narrow fallback when SHA unknown**
When LAST_DEPLOYED_SHA could not be determined the workflow diffed HEAD~1..HEAD — potentially missing many commits. Now it defaults to android=true / linux=true (deploy everything) as the safe fallback.

Additional changes:
- ::error:: / ::warning:: / ::notice:: annotations so skip/failure reasons surface in the Actions UI.
- scripts/verify_playstore_deploy.py: new post-deploy check that queries the internal track and fails if the latest version code is more than 1 hour old. (Version codes are Unix timestamps set by ci/main.go's PublishAndroid.) Catches silent deploy failures the upload API did not reject.
- scripts/test_verify_playstore_deploy.py: 5 unit tests for the verify script (all pass).

Co-authored-by: Thomas SharedInbox <sharedinbox@thomas-guettler.de>
Reviewed-on: https://codeberg.org/guettli/sharedinbox/pulls/364

scripts/test_verify_playstore_deploy.py

@@ -0,0 +1,85 @@
+#!/usr/bin/env python3
+"""Tests for verify_playstore_deploy.py."""
+import os
+import sys
+import time
+import unittest
+from pathlib import Path
+from unittest.mock import MagicMock, patch
+
+sys.path.insert(0, str(Path(__file__).parent))
+
+import verify_playstore_deploy
+
+
+def _make_session(version_code, track="internal"):
+    """Return a mock AuthorizedSession with the given version code on the track."""
+    session = MagicMock()
+
+    edit_resp = MagicMock()
+    edit_resp.json.return_value = {"id": "edit-99"}
+    session.post.return_value = edit_resp
+
+    track_resp = MagicMock()
+    track_resp.json.return_value = {
+        "releases": [{"versionCodes": [str(version_code)], "status": "completed"}]
+    }
+    session.get.return_value = track_resp
+    session.delete.return_value = MagicMock()
+
+    return session
+
+
+class TestMissingEnv(unittest.TestCase):
+    def test_missing_env_exits(self):
+        with patch.dict(os.environ, {}, clear=True):
+            with self.assertRaises(SystemExit) as ctx:
+                verify_playstore_deploy.main()
+        self.assertEqual(ctx.exception.code, 1)
+
+
+class TestRecentDeploy(unittest.TestCase):
+    def _run(self, version_code):
+        session = _make_session(version_code)
+        with patch.dict(os.environ, {"PLAY_STORE_CONFIG_JSON": '{"type":"service_account"}'}):
+            with patch("verify_playstore_deploy.service_account.Credentials.from_service_account_info"):
+                with patch("verify_playstore_deploy.AuthorizedSession", return_value=session):
+                    verify_playstore_deploy.main()
+
+    def test_recent_version_code_passes(self):
+        # Version code is Unix timestamp — a very recent one should pass.
+        recent_vc = int(time.time()) - 60  # 1 minute ago
+        self._run(recent_vc)
+
+    def test_old_version_code_fails(self):
+        old_vc = int(time.time()) - 7200  # 2 hours ago
+        with self.assertRaises(SystemExit) as ctx:
+            self._run(old_vc)
+        self.assertEqual(ctx.exception.code, 1)
+
+
+class TestEmptyTrack(unittest.TestCase):
+    def _run_empty(self, releases):
+        session = MagicMock()
+        session.post.return_value = MagicMock(**{"json.return_value": {"id": "edit-1"}})
+        session.get.return_value = MagicMock(**{"json.return_value": {"releases": releases}})
+        session.delete.return_value = MagicMock()
+
+        with patch.dict(os.environ, {"PLAY_STORE_CONFIG_JSON": '{"type":"service_account"}'}):
+            with patch("verify_playstore_deploy.service_account.Credentials.from_service_account_info"):
+                with patch("verify_playstore_deploy.AuthorizedSession", return_value=session):
+                    verify_playstore_deploy.main()
+
+    def test_no_releases_exits(self):
+        with self.assertRaises(SystemExit) as ctx:
+            self._run_empty([])
+        self.assertEqual(ctx.exception.code, 1)
+
+    def test_release_with_no_version_codes_exits(self):
+        with self.assertRaises(SystemExit) as ctx:
+            self._run_empty([{"status": "completed", "versionCodes": []}])
+        self.assertEqual(ctx.exception.code, 1)
+
+
+if __name__ == "__main__":
+    unittest.main()