feat: automatically create a migration file

src/index.ts

@@ -20,7 +20,7 @@ async function run(): Promise<void> {
 
     // Otherwise, run verify and leave a PR comment
     const issue_number = payload.pull_request?.number
-    const { success, message } = await verify();
+    const { success, message } = await verify(github.context);
 
     if (!issue_number) {
       const method = success ? 'info' : 'setFailed';
@@ -55,7 +55,7 @@ async function push() {
   await execa(bin, ['db', 'push'], { encoding: 'utf8', detached: true, reject: false })
 }
 
-async function verify() {
+async function verify(context: typeof github.context) {
   const root = resolve('astro', process.cwd())
   if (!root) {
     throw new Error(`Unable to locate the "astro" package. Did you remember to run install?`)
@@ -65,12 +65,24 @@ async function verify() {
   const status = JSON.parse(stdout);
   switch (status.state) {
     case 'no-migrations-found': return { success: false, message: 'No migrations found!\nTo scaffold your migrations folder, run `astro db sync`.\n' }
-		case 'ahead': return { success: false, message: 'Changes detected! To create the necessary migration file, run `astro db sync`.\n' }
+		case 'ahead': {
+      let instructions = '';
+      if (status.newFileContent) {
+        instructions = `[Commit a migration file](${getAddMigrationURL(context, status)}).`
+      } else {
+        instructions = `Create the necessary migration file by running \`astro db sync\`.`
+      }
+      return { success: false, message: `Changes detected! ${instructions}\n` }
+    }
 		case 'up-to-date': return { success: true, message: 'No migrations needed!\nYour database is up to date.' }
   }
   return { success: false, message: 'Unable to run `astro db verify`! Does your action install the `astro` package?' }
 }
 
+function getAddMigrationURL(context: typeof github.context, status: any) {
+  return `${context.payload.pull_request!.head.repo.html_url}/new/${context.payload.pull_request!.head.ref}?filename=./migrations/${status.newFilename}&value=${encodeURIComponent(status.newFileContent)}`;
+}
+
 async function getCommentId(
   params: { repo: string; owner: string; issue_number: number }
 ) {