Remove other remnant of the debian base arg

docker/prod/Dockerfile

@@ -1,9 +1,8 @@
 ARG RUBY_VERSION="3.4.7"
-ARG DEBIAN_BASE="trixie"
 # Add SBOM scan context for intermediate steps
 ARG BUILDKIT_SBOM_SCAN_CONTEXT=true
 ARG BUILDKIT_SBOM_SCAN_STAGE=true
-FROM ruby:${RUBY_VERSION}-slim-${DEBIAN_BASE} AS runtime-base
+FROM ruby:${RUBY_VERSION}-slim-trixie AS runtime-base
 LABEL maintainer="operations@openproject.com"
 
 ARG NODE_VERSION="22.21.0"

docker/pullpreview/docker-compose.yml

@@ -13,8 +13,6 @@ volumes:
 x-defaults: &defaults
   build:
     context: .
-    args:
-      DEBIAN_BASE: bookworm
   restart: unless-stopped
   env_file:
     - .env.pullpreview