Switch to node action

This is done to be able to pass loaded secrets as output. This is not available with a composite action, unless we hard-code the action's outputs, which is not a desired outcome.

src/index.ts

@@ -0,0 +1,24 @@
+import * as core from '@actions/core';
+import * as exec from '@actions/exec';
+import path from 'path';
+
+async function run(): Promise<void> {
+  try {
+    const parentDir = path.resolve(__dirname, '..');
+    
+    // Get action inputs
+    const unsetPrevious = core.getInput('unset-previous');
+    const exportEnv = core.getInput('export-env');
+
+    // Execute bash script
+    await exec.exec(`sh -c "` +
+      `INPUT_UNSET_PREVIOUS=` + unsetPrevious + ` ` +
+      `INPUT_EXPORT_ENV=` + exportEnv + ` ` + 
+      parentDir + `/entrypoint.sh"`);
+
+  } catch (error: any) {
+    core.setFailed(error.message);
+  }
+}
+
+run();