When having a `umask` of `xx7` (e.g. `027`) on the host machine then the directories `assets`, `config` and `locales` don't become readable to the `invidious` user inside the Docker container since the `COPY` commands result in files owned by `root` with the same file permissions like on the host (`640` in my case).
By adding `--chown=invidious` to the `COPY` command we ensure the `invidious` user can read these files.
* Untrack config.yml
`config/config.yml` has been untracked and moved to `config/config.example.yml`.
The Dockerfile has been updated to copy all `config/config.*` files and to try
to move `config/config.example.yml` to `config/config.yml`. If a user supplied
`config/config.yml` exists it is not overwritten.
* Update Dockerfile to use `shard.lock`
* Fix tests
This fixes currently failing Docker builds.
kemalcr/kemal in version 0.26.0 requires Crystal 0.30.0 which is not
yet available on Alpine 3.10 (previously used as the Docker base image).
Maykin-99