Hi Shantanu,
Now you are getting an error from curl itself. This kind of issues you should debug / research yourself, it has nothing to do with GitLab.
The first Google result: saucelabs - curl: (26) Failed to open/read local data from file/application - Stack Overflow suggests checking your quotes (single / double quoting when using curl is very sensitive). Please also in the future format your code in the post according to the community guidelines, so it is easier for everyone to read and spot potential syntax issues.