CONFIG_DIR file-based configuration ignored?

[Ginner]

First off thank you for all your work and for making a community edition available to your users!

I'm at the end of my wits. I'm attempting to get the docker compose project running with 'CONFIG_DIR' set.

Here's a relevant excerpt from my docker-compose.yml file:

services:
  plausible:
    image: ghcr.io/plausible/community-edition:v3.0.1
    volumes:
      - /run/secrets/plausible:/run/secrets:ro
    environment:
      CONFIG_DIR: /run/secrets   # I've attempte with and without this (as it should be default)
    depends_on:
      - plausible_db
      - plausible_events_db

Secret files on the host (notice read-permissions):

sudo ls -la /run/secrets/plausible
total 20
drwxr-x--- 2 root root 140 Oct 29 10:28 .
drwxr-x--- 3 root root  60 Oct 29 10:28 ..
-rw-r--r-- 1 root root  23 Oct 29 10:28 BASE_URL
-rw-r--r-- 1 root root  41 Oct 29 10:28 CLICKHOUSE_DATABASE_URL
-rw-r--r-- 1 root root  81 Oct 29 10:28 DATABASE_URL
-rw-r--r-- 1 root root  29 Oct 29 10:28 POSTGRES_PASSWORD
-rw-r--r-- 1 root root  64 Oct 29 10:28 SECRET_KEY_BASE

What I've attempted so far(amongst other, less sane trouble-shootings):

• I've verified that CONFIG_DIR is present in the container with docker inspect
• Verified the secret file's presence and contents (no \n, ", or similar - Single line variable)
• All kinds of file permission and ownership
• Tried mounting to /run/secrets/plausible and setting CONFIG_DIR to that
• Added BASE_URL as an environment variable in docker-compose.yml, Which bumps the issue down to SECRET_KEY_BASE(!)
• At each attempt I've nuked the containers (docker compose down -> docker system prune -a -> confirm empty docker ps, etc.)
• Added _FILE to the variables (Hail Mary, but one gets desperate)

It seems to me, that CONFIG_DIR file-based configuration are ignored or unread inside the container, causing Plausible to crash with “BASE_URL configuration option is required." and the container to perpetually restart.

Here is a full error output (perceived repetition excluded), docker logs plausible-plausible-1:

ERROR! Config provider Config.Reader failed with:
** (RuntimeError) BASE_URL configuration option is required. See https://github.com/plausible/community-edition/wiki/configuration#base_url
    /app/releases/0.0.1/runtime.exs:68: (file)
    (elixir 1.18.3) src/elixir.erl:386: :elixir.eval_external_handler/3
    (stdlib 6.2.2) erl_eval.erl:919: :erl_eval.do_apply/7
    (stdlib 6.2.2) erl_eval.erl:271: :erl_eval.exprs/6
    (elixir 1.18.3) src/elixir.erl:364: :elixir.eval_forms/4
    (elixir 1.18.3) lib/module/parallel_checker.ex:120: Module.ParallelChecker.verify/1
    (elixir 1.18.3) lib/code.ex:572: Code.validated_eval_string/3
    (elixir 1.18.3) lib/config.ex:316: Config.__eval__!/3

Runtime terminating during boot ({#{message=><<"BASE_URL configuration option is required. See https://github.com/plausible/community-edition/wiki/configuration#base_url">>,'__struct__'=>'Elixir.RuntimeError','__exception__'=>true},[{elixir_eval,'__FILE__',1,[{file,"/app/releases/0.0.1/runtime.exs"},{line,68}]},{elixir,eval_external_handler,3,[{file,"src/elixir.erl"},{line,386},{error_info,#{module=>'Elixir.Exception'}}]},{erl_eval,do_apply,7,[{file,"erl_eval.erl"},{line,919}]},{erl_eval,exprs,6,[{file,"erl_eval.erl"},{line,271}]},{elixir,eval_forms,4,[{file,"src/elixir.erl"},{line,364}]},{'Elixir.Module.ParallelChecker',verify,1,[{file,"lib/module/parallel_checker.ex"},{line,120}]},{'Elixir.Code',validated_eval_string,3,[{file,"lib/code.ex"},{line,572}]},{'Elixir.Config','__eval__!',3,[{file,"lib/config.ex"},{line,316}]}]})

Crash dump is being written to: erl_crash.dump...ERROR! Config provider Config.Reader failed with:
Runtime terminating during boot ({#{message=><<"BASE_URL configuration option is required. See https://github.com/plausible/community-edition/wiki/configuration#base_url">>,'__struct__'=>'Elixir.RuntimeError','__exception__'=>true},[{elixir_eval,'__FILE__',1,[{file,"/app/releases/0.0.1/runtime.exs"},{line,68}]},{elixir,eval_external_handler,3,[{file,"src/elixir.erl"},{line,386},{error_info,#{module=>'Elixir.Exception'}}]},{erl_eval,do_apply,7,[{file,"erl_eval.erl"},{line,919}]},{erl_eval,exprs,6,[{file,"erl_eval.erl"},{line,271}]},{elixir,eval_forms,4,[{file,"src/elixir.erl"},{line,364}]},{'Elixir.Module.ParallelChecker',verify,1,[{file,"lib/module/parallel_checker.ex"},{line,120}]},{'Elixir.Code',validated_eval_string,3,[{file,"lib/code.ex"},{line,572}]},{'Elixir.Config','__eval__!',3,[{file,"lib/config.ex"},{line,316}]}]})
** (RuntimeError) BASE_URL configuration option is required. See https://github.com/plausible/community-edition/wiki/configuration#base_url
    /app/releases/0.0.1/runtime.exs:68: (file)
    (elixir 1.18.3) src/elixir.erl:386: :elixir.eval_external_handler/3
    (stdlib 6.2.2) erl_eval.erl:919: :erl_eval.do_apply/7
    (stdlib 6.2.2) erl_eval.erl:271: :erl_eval.exprs/6
    (elixir 1.18.3) src/elixir.erl:364: :elixir.eval_forms/4
    (elixir 1.18.3) lib/module/parallel_checker.ex:120: Module.ParallelChecker.verify/1
    (elixir 1.18.3) lib/code.ex:572: Code.validated_eval_string/3
    (elixir 1.18.3) lib/config.ex:316: Config.__eval__!/3


Crash dump is being written to: erl_crash.dump...ERROR! Config provider Config.Reader failed with:
** (RuntimeError) BASE_URL configuration option is required. See https://github.com/plausible/community-edition/wiki/configuration#base_url
    /app/releases/0.0.1/runtime.exs:68: (file)
    (elixir 1.18.3) src/elixir.erl:386: :elixir.eval_external_handler/3
    (stdlib 6.2.2) erl_eval.erl:919: :erl_eval.do_apply/7
    (stdlib 6.2.2) erl_eval.erl:271: :erl_eval.exprs/6
    (elixir 1.18.3) src/elixir.erl:364: :elixir.eval_forms/4
    (elixir 1.18.3) lib/module/parallel_checker.ex:120: Module.ParallelChecker.verify/1
    (elixir 1.18.3) lib/code.ex:572: Code.validated_eval_string/3
    (elixir 1.18.3) lib/config.ex:316: Config.__eval__!/3

Any insight or comments are highly appreciated!