Bump backend version to 0.1.1 and validate plugin manifest sync

scripts/release/validate_release.py

@@ -11,6 +11,7 @@ from pathlib import Path
 ROOT = Path(__file__).resolve().parents[2]
 SETTINGS_PATH = ROOT / 'backend' / 'app' / 'core' / 'config.py'
 SIGNED_DIR = ROOT / 'XPI' / 'signed'
+MANIFEST_PATH = ROOT / 'webextension' / 'manifest.json'
 VERSION_RE = re.compile(r'\d+\.\d+\.\d+')
 
 
@@ -43,6 +44,12 @@ def main() -> None:
         fail(f'backend version {backend_version} is not a valid three-part version')
 
     extension_version, xpi_path = find_latest_signed_xpi()
+    source_manifest = json.loads(MANIFEST_PATH.read_text())
+    if source_manifest.get('version') != extension_version:
+        fail(
+            f'webextension/manifest.json version {source_manifest.get("version")!r} does not match '
+            f'the latest signed XPI version {extension_version!r}'
+        )
     with zipfile.ZipFile(xpi_path) as archive:
         try:
             packaged_manifest = json.loads(archive.read('manifest.json'))