build: install snapshot builds for angular-devkit and schematics

Our snapshot build jobs should also install the snapshots for the devkit
and schematics packages (owned by the tooling team). These need to match
up with the CLI package that is currently already updated by the snapshot
setup script.

Author: devversion

scripts/circleci/setup-angular-snapshots.js

@@ -14,6 +14,16 @@
  * Read more here: https://yarnpkg.com/lang/en/docs/package-json/#toc-resolutions
  */
 
+/**
+ * Regular expression matching packages we would like to install snapshots for.
+ *
+ * Assumes that all matched packages will have corresponding snapshot Github
+ * repositories under the Angular organization.
+ *
+ * Note that specific packages can be excluded in the `ignorePackages` array below.
+ */
+const targetPackageRegex = /^@(angular|angular-devkit|schematics)\//;
+
 /** List of packages which should not be updated to a snapshot build. */
 const ignorePackages = [
   // Skip update for the shared dev-infra package. We do not want to update to a snapshot
@@ -41,15 +51,18 @@ const snapshotPackages = Object.keys({
   ...packageJson.dependencies,
   ...packageJson.devDependencies,
 }).filter(
-  packageName => packageName.startsWith('@angular/') && !ignorePackages.includes(packageName),
+  packageName => targetPackageRegex.test(packageName) && !ignorePackages.includes(packageName),
 );
 
 console.log('Setting up snapshot builds for:\n');
 console.log(`  ${snapshotPackages.map(n => `${n}${packageSuffix}`).join('\n  ')}\n`);
 
 // Setup the snapshot version for each Angular package specified in the "package.json" file.
 snapshotPackages.forEach(packageName => {
-  const buildsUrl = `github:angular/${packageName.split('/')[1]}-builds${tag ? `#${tag}` : ''}`;
+  const parts = packageName.split('/');
+  const scopeName = parts[0].substring(1);
+  const snapshotRepoPrefix = scopeName === 'angular' ? parts[1] : `${scopeName}-${parts[1]}`;
+  const buildsUrl = `github:angular/${snapshotRepoPrefix}-builds${tag ? `#${tag}` : ''}`;
 
   // Add resolutions for each package in the format "**/{PACKAGE}" so that all
   // nested versions of that specific Angular package will have the same version.