fix: allow basic auth header overwrites (repo-sync#21)

GitHub Actions automatically set basic auth header overwriting access tokens supplied in HTTPS clone urls.

Fix repo-sync#18

Merge pull request repo-sync#15 from repo-sync/all-contributors/add-x…

…tqqczze

docs: add xtqqczze as a contributor

feat: rename project

fix: ssh private key handling

feat: validate parameters

feat: cleanup remote after use

docs: update example to use major version

fix: ssh private key handling

feat: update workflow syntax

docs: update workflow instructions to yml