[Idea] Configure location of pghero.yaml via ENV

[azanar]

Use case: I am using the ankane/pghero docker image in a Kubernetes cluster.

I would like to be able to define a /app/config/pghero.yaml file as a Kubernetes resource, to be mounted into the container.

Limitation: Unfortunately, Kubernetes can only mount directories, which means masking the other contents of /app/config/. This includes /app/config/puma.rb:

/usr/local/bundle/gems/puma-3.12.0/lib/puma/dsl.rb:41:in `read': No such file or directory @ rb_sysopen - config/puma.rb (Errno::ENOENT)

Idea: It would be lovely to be able to provide an alternate path to locate pghero.yaml or be able to define it as an environmental variable. As an example declaration:

ENV['PGHERO_YML_FILE'] = '/mnt/pghero.yaml'

This would enable mounting a volume containing it wherever, and supporting this quirk of Kubernetes.

Happy to hear thoughts.

[ankane]

Thanks for the clear explanation @azanar. Going with ENV["PGHERO_CONFIG_PATH"] as proposed in #244.

[ankane]

Just pushed a new version to Docker Hub under ankane/pghero:latest. Let me know how it works for you.

[azanar]

@ankane works great. thank you!