graceful exit on existing tag

version-check/main.ts

@@ -35,8 +35,12 @@ try {
   console.log(`Tag ${tag} already exists.`);
   created = false;
 } catch {
+  try {
     await run("git", ["tag", tag]);
     await run("git", ["push", "origin", tag]);
+  } catch {
+    created = false;
+  }
 }
 if (created) {
   const out = Deno.env.get("GITHUB_OUTPUT");
@@ -54,6 +58,7 @@ if (created) {
   } else {
     console.error("GITHUB_OUTPUT not set.");
   }
+  Deno.exit(0);
 }
 
 async function run(cmd: string, args: string[]) {