Refactor Main.ts to use Env Files

src/main.ts

@@ -1,18 +1,26 @@
-import * as core from '@actions/core'
-import fs from 'fs'
-import util from 'util'
+import * as core from '@actions/core';
+import fs from 'fs';
+import util from 'util';
 
 async function run(): Promise<void> {
   try {
-    const filePath = core.getInput('path')
-    const encoding = core.getInput('encoding')
-    const readFile = util.promisify(fs.readFile)
-    const contents = await readFile(filePath, encoding)
-    core.info(`File contents:\n${contents}`)
-    core.setOutput('contents', contents)
+    const filePath = core.getInput('path');
+    const encoding = core.getInput('encoding');
+    const readFile = util.promisify(fs.readFile);
+    const contents = await readFile(filePath, encoding);
+    core.info(`File contents:\n${contents}`);
+
+    // Write to environment file
+    const outputFilePath = process.env.GITHUB_ENV || '';
+    if (outputFilePath) {
+      const output = `contents<<EOF\n${contents}\nEOF`;
+      await fs.promises.appendFile(outputFilePath, output + '\n');
+    } else {
+      core.warning('GITHUB_ENV not defined. Cannot write to environment file.');
+    }
   } catch (error) {
-    core.setFailed(error.message)
+    core.setFailed(error.message);
   }
 }
 
-run()
+run();