I have built a website that includes functionality for users to build .apk files. The process involves several steps:

• Get a copy from the main default Android app for the specific user.
• Allow users to copy their own assets.
• Build the app.

When building the app, my code executes a .bat file using the following command:
./gradlew build assembleDebug assembleDebugUnitTest assembleDebugAndroidTest

Here is the relevant part of my code for executing the function:

const util = require("util");
const exec = util.promisify(require("child_process").exec);

await exec(`${andpath}\assembleDebug.bat`, (error, stdout, stderr) => {
    process.chdir(originalDirectory);
    if (error) {
        console.log("error" + error);
        res.status(500).json({ success: false, error: "APK build failed" });
    } else {
        console.log("APK build successful");
        res.status(200).json({ success: true });
    }
});

This setup works correctly on my local machine. However, when I deploy it on the server, I encounter the following error:

errorError: Command failed: ./assembleDebug.bat

FAILURE: Build failed with an exception.

* What went wrong:
java.io.IOException: Permission denied

* Try:
> Run with --stacktrace option to get the stack trace.
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Additional Information:

1. The server is running on Linux.
2. I am not using Android Studio IDE.
3. I have verified that the .bat file exists and is in the correct directory.
4. I have checked file permissions and they appear to be set correctly.
5. When I manually run the .bat file on the server terminal, it builds the APK successfully.
6. I have executed the command chmod -R +x ./androidproject.

Questions:

What could be causing this Permission denied error when running the Gradle command via the Node.js script on the server?

How can I resolve this issue to successfully build the .apk file on the server through the script?

Any help would be greatly appreciated!

What I Have Tried:

1. Checking and adjusting file permissions.
2. Running the command manually on the server, which builds the APK successfully.
   
3. Executing chmod -R +x ./androidproject.