Update docker actions

Update readme

Go 1.24: add tools

Maintenance update

Update dockerfile

Cleanup

Merge pull request #25 from abegaj/feat/otpauth-docker-file

Docker support

Merge pull request #23 from dim13/rev

Add -rev flag to generate otpauth-migration:// QR-code

Restrict file name to AlNum only

Fixes #20

Simplify digit count