feat: replace commit statuses with checks

GitHub checks are the new way to report CI status. They are more
flexible and can be used for more than just CI. They also have a
dedicated API, which is more convenient than the status API.

It allows us to show more information about commit validation.

src/action.ts

@@ -23,13 +23,20 @@ const action = (probot: Probot) => {
       );
 
       const prMetadata = pullRequestMetadataSchema.parse(prMetadataUnsafe);
+      const commitSha = prMetadata.commits[prMetadata.commits.length - 1].sha;
 
-      await context.octokit.repos.createCommitStatus(
+      // Initialize check run - check in progress
+      // https://docs.github.com/en/rest/checks/runs?apiVersion=2022-11-28#create-a-check-run
+      const checkRun = await context.octokit.checks.create(
         context.repo({
-          state: 'pending',
-          sha: prMetadata.commits[prMetadata.commits.length - 1].sha,
-          description: 'validation',
-          context: `Advanced Commit Linter`,
+          name: 'Advanced Commit Linter',
+          head_sha: commitSha,
+          status: 'in_progress',
+          started_at: new Date().toISOString(),
+          output: {
+            title: 'Advanced Commit Linter',
+            summary: 'Commit validation in progress',
+          },
         })
       );
 
@@ -56,11 +63,18 @@ const action = (probot: Probot) => {
 
       setOutput('validated-pr-metadata', JSON.stringify(validated, null, 2));
 
-      await context.octokit.repos.createCommitStatus(
+      // Update check run - check completed + conclusion
+      // https://docs.github.com/en/rest/checks/runs?apiVersion=2022-11-28#update-a-check-run
+      await context.octokit.checks.update(
         context.repo({
-          state: validated.validation.status,
-          sha: prMetadata.commits[prMetadata.commits.length - 1].sha,
-          context: `Advanced Commit Linter`,
+          check_run_id: checkRun.data.id,
+          status: 'completed',
+          completed_at: new Date().toISOString(),
+          conclusion: validated.validation.status,
+          output: {
+            title: 'Advanced Commit Linter',
+            summary: validated.validation.message,
+          },
         })
       );
     }