This introduces a new application option `--port`/`-p` to switch the
listening port from 3000 (default) to another port.
Docker image can be configured using the corresponding environment
variable `GITEA_SQ_BOT_PORT`.
Helm Chart allows setting `.Values.app.listeningPort`
Resolves: #25
Signed-off-by: Steven Kriegler <sk.bunsenbrenner@gmail.com>
Instead of re-inventing the wheel regarding configuration location
handling and validation, this introduces a new command flag `--config`
allowing for full flexibility of configuration filename and location.
This flag can also be defined via environment variable which allows
an easy way of starting the bot from command line, inside a Docker
container or using the Helm Chart.
It makes the custom environment lookup unnecessary and reduces some
complexity during startup and for writing tests.
Resolves: #10
Signed-off-by: Steven Kriegler <sk.bunsenbrenner@gmail.com>
