feat(docker): Switch to a distroless base image

[Dav1dde]

Switches the docker image to a distroless variant.

Refs: #4871

[aldy505]

there you go

relay-1                            | error: 'relay' requires a subcommand but one was not provided
relay-1                            |   [subcommands: run, credentials, config, generate-completions]
relay-1                            | 
relay-1                            | Usage: relay [OPTIONS] <COMMAND>
relay-1                            | 
relay-1                            | For more information, try '--help'.

[aldy505]

@BYK when you get back, I think this would better be included on the self-hosted e2e test action?