Merge pull request #40 from git-pkgs/mirror-feature

Add mirror command and API for selective package mirroring

Merge pull request #71 from git-pkgs/fix-composer-dist-urls

Fix composer dist URL rewriting and browse source

Remove redundant cooldown ecosystem list from README

The supported registries table already shows which ecosystems have
cooldown support. The inline list kept getting out of sync.

Add workflow to publish Docker image to GHCR on release (#35)