Support GH enterprise

[zentale]

I see github.com is hardcoded in these lines.

push-protected/entrypoint.sh

Lines 105 to 107 in f28401e

	git config --local --name-only --get-regexp "http\.https\:\/\/github\.com\/\.extraheader" && git config --local --unset-all "http.https://github.com/.extraheader" || :
	git submodule foreach --recursive 'git config --local --name-only --get-regexp "http\.https\:\/\/github\.com\/\.extraheader" && git config --local --unset-all "http.https://github.com/.extraheader" || :'
	git remote set-url origin https://${GITHUB_ACTOR}:${INPUT_TOKEN}@github.com/${GITHUB_REPOSITORY}.git

It would be awesome to have a parameter for the github instance.

[zentale]

It wouldnt need a parameter, since there is an env variable available as default.

https://docs.github.com/en/actions/learn-github-actions/variables#default-environment-variables
GITHUB_SERVER_URL

[CasperWA]

@zentale, please use the upcoming v2.15.0 to check whether #205 truly fixed this issue.