feat: support timezones in mariadb

Pass timezone info to the runtime container to make MariaDB pick it up:

```bash
$ docker run -it -e "TZ=CET" jbergstroem/mariadb-alpine
```

PR: #266

chore(deps): all non-major dependencies

chore(deps): mariadb v10.6.13-r0

chore(deps): alstr/todo-to-issue-action v4.9.3

chore: update to alpine 3.17.1

This also forces a new base image (3.17 was briefly a beta image).

feat: docker secrets

Manage your sensitive information via `docker secrets` and pass it through compose.

Fixes: #48

chore: update docker labels

feat: mariadb 10.6.8

feat(version): update to mariadb 10.6.7

v10.4.19