[no-relnote] Add cherrypick workflow from gpu-operator repo

This captures the state at 59a01fde91a53105a6a183a2e8a86f7f16b54622

Signed-off-by: Evan Lezar <[email protected]>

Author: elezar

.github/scripts/add-labels-from-comment.js

@@ -0,0 +1,110 @@
+/**
+ * Copyright 2025 NVIDIA CORPORATION
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+module.exports = async ({ github, context, core }) => {
+  const commentBody = context.payload.comment.body;
+  const prNumber = context.payload.issue.number;
+
+  core.info(`Processing comment: ${commentBody}`);
+
+  // Parse comment for /cherry-pick branches
+  const cherryPickPattern = /^\/cherry-pick\s+(.+)$/m;
+  const match = commentBody.match(cherryPickPattern);
+
+  if (!match) {
+    core.warning('Comment does not match /cherry-pick pattern');
+    return { success: false, message: 'Invalid format' };
+  }
+
+  // Extract all release branches (space-separated)
+  const branchesText = match[1].trim();
+  const branchPattern = /release-\d+\.\d+(?:\.\d+)?/g;
+  const branches = branchesText.match(branchPattern) || [];
+
+  if (branches.length === 0) {
+    core.warning('No valid release branches found in comment');
+    await github.rest.reactions.createForIssueComment({
+      owner: context.repo.owner,
+      repo: context.repo.repo,
+      comment_id: context.payload.comment.id,
+      content: 'confused'
+    });
+    return { success: false, message: 'No valid branches found' };
+  }
+
+  core.info(`Found branches: ${branches.join(', ')}`);
+
+  // Add labels to PR
+  const labels = branches.map(branch => `cherry-pick/${branch}`);
+  
+  try {
+    await github.rest.issues.addLabels({
+      owner: context.repo.owner,
+      repo: context.repo.repo,
+      issue_number: prNumber,
+      labels: labels
+    });
+    core.info(`Added labels: ${labels.join(', ')}`);
+  } catch (error) {
+    core.error(`Failed to add labels: ${error.message}`);
+    await github.rest.reactions.createForIssueComment({
+      owner: context.repo.owner,
+      repo: context.repo.repo,
+      comment_id: context.payload.comment.id,
+      content: '-1'
+    });
+    return { success: false, message: error.message };
+  }
+
+  // React with checkmark emoji
+  await github.rest.reactions.createForIssueComment({
+    owner: context.repo.owner,
+    repo: context.repo.repo,
+    comment_id: context.payload.comment.id,
+    content: '+1'
+  });
+
+  // Check if PR is already merged
+  const { data: pullRequest } = await github.rest.pulls.get({
+    owner: context.repo.owner,
+    repo: context.repo.repo,
+    pull_number: prNumber
+  });
+
+  if (pullRequest.merged) {
+    core.info('PR is already merged - triggering backport immediately');
+    
+    // Set branches in environment and trigger backport
+    process.env.BRANCHES_JSON = JSON.stringify(branches);
+    
+    // Run backport script
+    const backportScript = require('./backport.js');
+    const results = await backportScript({ github, context, core });
+    
+    return { 
+      success: true, 
+      message: `Labels added and backport triggered for: ${branches.join(', ')}`,
+      backportResults: results
+    };
+  } else {
+    core.info('PR not yet merged - labels added, backport will trigger on merge');
+    return { 
+      success: true, 
+      message: `Labels added for: ${branches.join(', ')}. Backport will trigger on merge.`
+    };
+  }
+};
+