Add support for custom download URL

[mamercad]

This would help folks with GHES, etc

[eifinger]

Hi and thank you for your PR.

Can you please give a bit more information?

• How exactly does this help GHES users?
• What doesn't work currently?
• What is etc?

Thank you

[mamercad]

Hi and thank you for your PR.

Can you please give a bit more information?

• How exactly does this help GHES users?
• What doesn't work currently?
• What is etc?

Thank you

We run GHES and we would do something like this:

custom-download-url: "https://github.internal.tld/${OWNER}/${REPO}/releases/download/${version}/${artifact}${extension}"

I don't know TypeScript, so, guessing through things in this PR.

[eifinger]

I still don't understand why this change is needed. If you want to download from your own source, why do you need this action instead of "curl-ing" your private url and add the matchers?