Create workflow to trigger adyen-postman action on push to main

[jlengrand]

Summary

• This commit creates a new workflow that will trigger a github action on the adyen-postman repository every time a new commit is pushed to main on this repository. It is a necessary step to have postman definition files that are always up to date

[jlengrand]

@wboereboom @AlexandrosMor any chance this can be merged plz?

[jlengrand]

I don't have rights to merge 😬 . Thanks for approving @AlexandrosMor . Anyone?

[jlengrand]

Closing this in favor of https://github.com/Adyen/adyen-openapi/pull/38