feat: issue a combined PR comment for all releases

also fixes the release URL with non-ascii characters

fixes googleapis#2285

src/manifest.ts

@@ -1219,19 +1219,35 @@ export class Manifest {
     );
     const duplicateReleases: DuplicateReleaseError[] = [];
     const githubReleases: CreatedRelease[] = [];
+    let error: unknown | undefined;
     for (const release of releases) {
+      // stop releasing once we hit an error
+      if (error) continue;
       try {
         githubReleases.push(await this.createRelease(release));
       } catch (err) {
         if (err instanceof DuplicateReleaseError) {
           this.logger.warn(`Duplicate release tag: ${release.tag.toString()}`);
           duplicateReleases.push(err);
         } else {
-          throw err;
+          error = err;
         }
       }
     }
 
+    if (githubReleases.length > 0) {
+      // comment on pull request about the successful releases
+      const releaseList = githubReleases
+        .map(({tagName, url}) => `- [${tagName}](${url})`)
+        .join('\n');
+      const comment = `:robot: Created releases:\n${releaseList}\n:sunflower:`;
+      await this.github.commentOnIssue(comment, pullRequest.number);
+    }
+
+    if (error) {
+      throw error;
+    }
+
     if (duplicateReleases.length > 0) {
       if (
         duplicateReleases.length + githubReleases.length ===
@@ -1266,10 +1282,6 @@ export class Manifest {
       prerelease: release.prerelease,
     });
 
-    // comment on pull request
-    const comment = `:robot: Release is at ${githubRelease.url} :sunflower:`;
-    await this.github.commentOnIssue(comment, release.pullRequest.number);
-
     return {
       ...githubRelease,
       path: release.path,

test/manifest.ts

@@ -5722,7 +5722,7 @@ describe('Manifest', () => {
       expect(releases[3]!.sha).to.eql('abc123');
       expect(releases[3]!.notes).to.be.string;
       expect(releases[3]!.path).to.eql('packages/datastore-lock');
-      sinon.assert.callCount(commentStub, 4);
+      sinon.assert.callCount(commentStub, 1);
       sinon.assert.calledOnceWithExactly(
         addLabelsStub,
         ['autorelease: tagged'],
@@ -6200,7 +6200,7 @@ describe('Manifest', () => {
       expect(releases[2]!.sha).to.eql('abc123');
       expect(releases[2]!.notes).to.be.string;
       expect(releases[2]!.path).to.eql('packages/datastore-lock');
-      sinon.assert.callCount(commentStub, 3);
+      sinon.assert.callCount(commentStub, 1);
       sinon.assert.calledOnceWithExactly(
         addLabelsStub,
         ['autorelease: tagged'],