Bump to Alpine 3.19

Document "shallow update not allowed" workaround

Describe gotcha about encrypted keys to README (#12)

fix: explicitly push to refs/heads/$branch

Update README according to GitLab menu changes

Push proper commit when GIT_STRATEGY=clone. Fixes #7

Merge pull request #5 from kasfactory/master

Changes `--push` by `--force` in the `git push` command that causes an error

Optionally disable git force push.

Add MIT license (fix #2)

Pass custom port to ssh-keyscan call (actually fix #1)

Document push to non-master branch

Use Alpine 3.6

Document how to push to a non-standard port (fix #1)

Update README to reflect recent GitLab changes