Process input and create check-run

src/utils/github-utils.ts

@@ -0,0 +1,11 @@
+import * as github from '@actions/github'
+import {EventPayloads} from '@octokit/webhooks'
+
+export function getCheckRunSha(): string {
+  if (github.context.payload.pull_request) {
+    const pr = github.context.payload.pull_request as EventPayloads.WebhookPayloadPullRequestPullRequest
+    return pr.head.sha
+  }
+
+  return github.context.sha
+}