Try once more in production

docker/rails.Dockerfile

@@ -20,23 +20,22 @@ RUN apt-get update && \
 
 WORKDIR /opt/exercism/website
 
-RUN gem install bundler -v "${BUNDLER_VERSION}"
+RUN gem install --default bundler -v "${BUNDLER_VERSION}"
+
+RUN bundle config set frozen 'true' && \
+    bundle config set without 'development test' && \
+    bundle config set ignore_funding_requests 'true' && \
+    bundle config set ignore_messages 'true' && \
+    bundle config set system 'true' && \
+    bundle config set disable_shared_gems 'false' && \
+    bundle config set version "${BUNDLER_VERSION}"
+
 RUN gem install propshaft -v 0.4.0
 RUN gem install nokogiri -v 1.15.4
 RUN gem install anycable -v 1.2.5
 RUN gem install oj -v 3.14.2
 RUN gem install rugged -v 1.6.3
 
-RUN echo $(bundle config list)
-
-RUN bundle config set deployment 'true' && \
-    bundle config set without 'development test' && \
-    bundle config set disable_shared_gems 'false' && \
-    bundle config set ignore_funding_requests 'true' && \
-    bundle config set ignore_messages 'true'
-
-RUN echo $(bundle config list)
-
 # Only Gemfile and Gemfile.lock changes require a new bundle install
 COPY Gemfile Gemfile.lock ./
 RUN bundle install && \