git pull not executing through a webhook in bash script - node.js

Question

I have a node server running on ec2 in ubuntu which should update when I push into master as I have created a hook for that in Gitab integrations.
I saw the hook working through the logs and executing every command expect simple git pull.
I have checked many similar questions which have suggestions like appending env -i to reset the GIT_DIR so that the command can execute but no luck so far.
I tried executing different commands like git status and they are executing through the hook in bash script normally.
Here is my script which is in my home folder along with the repository:
#!bin/bash
cd toTheFolder
git pull
here is the end-point which executes the script
childProcess.exec(
"bash temp.sh",
{ cwd: "/home/ubuntu/repoFolder" },
function(err, stdout, stderr) {
console.log(stdout, stderr);
if (err) {
return res.status(500).send(err);
}
res.status(200).send("OK");
}
);
The error it returns is {"killed":false,"code":1,"signal":null,"cmd":"bash temp.sh"}
Any thoughts on why simple git pull is not working would be a huge help.
-Thanks
EDIT: here is the output of stdout
git#gitlab.com: Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.

Answer 1

Use the following command
git pull https://username:password#mygithost.com/my/repository
Remember to replace the [username:password] with your git credentials, [mygithost.com] with your git host ( gitlab, ..etc), [my/repository] with your repository url
It would not work for github anyway cause they removed the username/password authentication support.
For github please check your ssh connection between your server and github.