feat(flows.yaml): [nan-1761] add github app push

[khaliqgant]

Describe your changes

When the flows.yaml file changes push it to the nango repo so that the file is always up to date. I opted for a Github Action because that seem more fitting to the purposes of a Github App rather than a separate bot user. Additionally a Github App can have special bypass permissions

Issue ticket number and link

NAN-1761

Checklist before requesting a review (skip if just adding/editing APIs & templates)

• I added tests, otherwise the reason is:

• External API requests have retries

• Pagination is used where appropriate

• The built in nango.paginate call is used instead of a while (true) loop

• Third party requests are parallelized (this can cause issues with rate limits)

• If a sync requires metadata the nango.yaml has auto_start: false

• If the sync is a full sync then track_deletes: true is set

[linear]

NAN-1761 An update to the integration-scripts repo should push the flows.yaml to the `nango` repo

[khaliqgant]

Lint issues will be fixed in #2

[bodinsamuel]

Looks good, hopefully it works 👌🏻