Create milestone if missing in label-and-milestone workflow

roji · Copilot · roji · commit 2f1fb8f8dd2d · 2026-03-17T19:36:05.000+01:00
When the label-and-milestone-issues workflow sets a milestone on closed
issues, create the milestone via the REST API if it doesn't already
exist, instead of failing with 'milestone not found'.

Co-authored-by: Copilot &lt;223556219+Copilot@users.noreply.github.com&gt;
diff --git a/.github/workflows/label-and-milestone-issues.yml b/.github/workflows/label-and-milestone-issues.yml
@@ -115,10 +115,16 @@ jobs:
                 }
               }
             `, { owner, repo, title: targetMilestoneName });
-            const milestoneNode = milestoneResult.repository.milestones.nodes
+            let milestoneNode = milestoneResult.repository.milestones.nodes
               .find(m => m.title === targetMilestoneName);
             if (!milestoneNode) {
-              throw new Error(`Milestone '${targetMilestoneName}' not found`);
+              console.log(`Milestone '${targetMilestoneName}' not found, creating it`);
+              const { data: created } = await github.rest.issues.createMilestone({
+                owner,
+                repo,
+                title: targetMilestoneName
+              });
+              milestoneNode = { number: created.number, title: created.title };
             }
 
             // Set the milestone on closing issues, applying a "min" strategy:

Original file line number	Diff line number	Diff line change
`@@ -115,10 +115,16 @@ jobs:`
`115`	`115`	`}`
`116`	`116`	`}`
`117`	`117`	`, { owner, repo, title: targetMilestoneName });
`118`		`- const milestoneNode = milestoneResult.repository.milestones.nodes`
	`118`	`+ let milestoneNode = milestoneResult.repository.milestones.nodes`
`119`	`119`	`.find(m => m.title === targetMilestoneName);`
`120`	`120`	`if (!milestoneNode) {`
`121`		- throw new Error(`Milestone '${targetMilestoneName}' not found`);
	`121`	+ console.log(`Milestone '${targetMilestoneName}' not found, creating it`);
	`122`	`+ const { data: created } = await github.rest.issues.createMilestone({`
	`123`	`+ owner,`
	`124`	`+ repo,`
	`125`	`+ title: targetMilestoneName`
	`126`	`+ });`
	`127`	`+ milestoneNode = { number: created.number, title: created.title };`
`122`	`128`	`}`
`123`	`129`
`124`	`130`	`// Set the milestone on closing issues, applying a "min" strategy:`