Configurable provider repos

[MPV]

The implementation currently assumes all providers have repos named like this:

tfupdate-github-actions/entrypoint.sh

Line 38 in e78ae0e

VERSION=$(tfupdate release latest terraform-providers/terraform-provider-${TFUPDATE_PROVIDER_NAME})

Here's an example where this doesn't work:

$ tfupdate release latest terraform-providers/terraform-provider-sops
failed to get the latest release for terraform-providers/terraform-provider-sops: GET https://api.github.com/repos/terraform-providers/terraform-provider-sops/releases/latest: 404 Not Found []

...compared to this that works:

$ tfupdate release latest carlpett/terraform-provider-sops
0.5.2

It would be nice if it was possible to configure the full provider repo name, and not just the last part:

tfupdate-github-actions/action.yml

Lines 15 to 17 in e78ae0e

	tfupdate_provider_name:
	description: 'A name of provider (used if `provider` is given as the subcommand)'
	required: false

[MPV]

Semi-related: I've also raised minamijoyo/tfupdate#28 about not being able to get "latest" on all types of providers (for example terraform-provider-github), which this action currently assumes would work (since we're talking about changes to the same line here). Let me know if you'd like to discuss that separately in another issue.

[MPV]

There's also a new option in tfupdate to consider:

--source-type tfregistryProvider

...as per minamijoyo/tfupdate#28 (comment)

[MPV]

Here's another example of this not working:

$ tfupdate release latest terraform-providers/terraform-provider-openstack
failed to get the latest release for terraform-providers/terraform-provider-openstack: GET https://api.github.com/repositories/294770956/releases/latest: 404 Not Found []

vs

$ tfupdate release latest terraform-provider-openstack/terraform-provider-openstack
1.35.0

[MPV]

I took another look at tfupdate, but it seems using non-default GitHub owner (i.e. anything else than terraform-providers/xyz) isn't supported yet for the tfupdate provider anyway: minamijoyo/tfupdate#28 (comment)