Use new way of outputting values from step/action

Refs: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

main.js

@@ -1,34 +1,36 @@
 const { exec } = require('child_process');
+const fs = require('fs');
+
 exec(`git for-each-ref --sort=-taggerdate --count 1 --format="%(refname:short)" "refs/tags/*"`, (err, tag, stderr) => {
+    tag = tag.trim();
+
     if (err) {
         console.log('\x1b[33m%s\x1b[0m', 'Could not find any tags because: ');
         console.log('\x1b[31m%s\x1b[0m', stderr);
         process.exit(1);
-    } else if(tag === "") {
+    } else if (tag === "") {
         let timestamp = Math.floor(new Date().getTime() / 1000);
         console.log('\x1b[33m%s\x1b[0m', 'Falling back to default tag');
         console.log('\x1b[32m%s\x1b[0m', `Found tag: ${process.env.INPUT_FALLBACK}`);
         console.log('\x1b[32m%s\x1b[0m', `Found timestamp: ${timestamp}`);
-        console.log(`::set-output name=tag::${process.env.INPUT_FALLBACK}`);
-        console.log(`::set-output name=timestamp::${timestamp}`);
+        fs.appendFileSync(process.env.GITHUB_OUTPUT, `tag=${process.env.INPUT_FALLBACK}\r\n`);
+        fs.appendFileSync(process.env.GITHUB_OUTPUT, `timestamp=${timestamp}\r\n`);
         process.exit(0);
     }
 
-    tag = tag.trim()
-
     exec(`git log -1 --format=%at ${tag}`, (err, timestamp, stderr) => {
         if (err) {
             console.log('\x1b[33m%s\x1b[0m', 'Could not find any timestamp because: ');
             console.log('\x1b[31m%s\x1b[0m', stderr);
             process.exit(1);
         }
 
-        timestamp = timestamp.trim()
+        timestamp = timestamp.trim();
 
         console.log('\x1b[32m%s\x1b[0m', `Found tag: ${tag}`);
         console.log('\x1b[32m%s\x1b[0m', `Found timestamp: ${timestamp}`);
-        console.log(`::set-output name=tag::${tag}`);
-        console.log(`::set-output name=timestamp::${timestamp}`);
+        fs.appendFileSync(process.env.GITHUB_OUTPUT, `tag=${tag}\r\n`);
+        fs.appendFileSync(process.env.GITHUB_OUTPUT, `timestamp=${timestamp}\r\n`);
         process.exit(0);
     });
 });