* chore(build): allow a custom `zebrad` config file path
Previous behavior:
The zebrad config file was hardcoded into the Dockerfile, allowing to
change specific values, but not the config file as a whole
Expected behavior:
Allow the user to specify the config file themselves, for example with
the nginx image you can pass -v /host/path/nginx.conf:/etc/nginx/nginx.conf:ro
Solution:
Use and ARG, with a default value, to allow the user to change the location
of the zebrad configuration file. This also sets the location under /etc,
honoring The Filesystem Hierarchy Standard (FHS) for linux
* Apply suggestions from code review
Co-authored-by: teor <teor@riseup.net>
Co-authored-by: teor <teor@riseup.net>
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