Expand secret environment variables in accessory files #1601
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When accessory file ends with
.erb, it's possible to interpolate environment variables in it. Currently, only clear environment variables are expanded. Not sure if it was a deliberate choice.This PR includes all env variables (including the aliased ones) in the ERB template processing.
Background: I was trying to run PgBouncer (a PostgreSQL connection pooler) as an accessory, which required the database connection string to be present in its configuration file. I managed to work around this by generating the final config file through a Docker entrypoint script. However, if this PR is accepted, the setup would become much simpler.