speedup docker build time

railties/lib/rails/generators/app_base.rb

@@ -561,6 +561,22 @@ module Rails
         binfixups
       end
 
+      def dockerfile_base_packages
+        # Add curl to work with the default healthcheck strategy in Kamal
+        packages = ["curl"]
+
+        # ActiveRecord databases
+        packages << base_package_for_database unless skip_active_record?
+
+        # ActiveStorage preview support
+        packages << "libvips" unless skip_active_storage?
+
+        # jemalloc for memory optimization
+        packages << "libjemalloc2"
+
+        packages.compact.sort
+      end
+
       def dockerfile_build_packages
         # start with the essentials
         packages = %w(build-essential git pkg-config)
@@ -568,11 +584,6 @@ module Rails
         # add database support
         packages << build_package_for_database unless skip_active_record?
 
-        # ActiveStorage preview support
-        packages << "libvips" unless skip_active_storage?
-
-        packages << "curl" if using_js_runtime?
-
         packages << "unzip" if using_bun?
 
         # node support, including support for building native modules
@@ -585,22 +596,6 @@ module Rails
         packages.compact.sort
       end
 
-      def dockerfile_deploy_packages
-        # Add curl to work with the default healthcheck strategy in Kamal
-        packages = ["curl"]
-
-        # ActiveRecord databases
-        packages << deploy_package_for_database unless skip_active_record?
-
-        # ActiveStorage preview support
-        packages << "libvips" unless skip_active_storage?
-
-        # jemalloc for memory optimization
-        packages << "libjemalloc2"
-
-        packages.compact.sort
-      end
-
       def css_gemfile_entry
         return if options[:api]
         return unless options[:css]

railties/lib/rails/generators/database.rb

@@ -67,7 +67,7 @@ module Rails
         end
       end
 
-      def deploy_package_for_database(database = options[:database])
+      def base_package_for_database(database = options[:database])
         case database
         when "mysql" then "default-mysql-client"
         when "postgresql" then "postgresql-client"

railties/lib/rails/generators/rails/app/templates/Dockerfile.tt

@@ -7,19 +7,21 @@ FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base
 # Rails app lives here
 WORKDIR /rails
 
+# Install base packages
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y <%= dockerfile_base_packages.join(" ") %>
+
 # Set production environment
 ENV RAILS_ENV="production" \
     BUNDLE_DEPLOYMENT="1" \
     BUNDLE_PATH="/usr/local/bundle" \
     BUNDLE_WITHOUT="development"
 
-
 # Throw-away build stage to reduce size of final image
 FROM base as build
 
 # Install packages needed to build gems<%= using_node? ? " and node modules" : "" %>
-RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y <%= dockerfile_build_packages.join(" ") %>
+RUN apt-get install --no-install-recommends -y <%= dockerfile_build_packages.join(" ") %>
 
 <% if using_node? -%>
 # Install JavaScript dependencies
@@ -79,13 +81,9 @@ RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
 # Final stage for app image
 FROM base
 
-<% unless dockerfile_deploy_packages.empty? -%>
-# Install packages needed for deployment
-RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y <%= dockerfile_deploy_packages.join(" ") %> && \
-    rm -rf /var/lib/apt/lists /var/cache/apt/archives
+# Clean up installation packages to reduce image size
+RUN rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
-<% end -%>
 # Copy built artifacts: gems, application
 COPY --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
 COPY --from=build /rails /rails

railties/lib/rails/generators/rails/app/templates/github/ci.yml.tt

@@ -99,7 +99,7 @@ jobs:
     <%- end -%>
     steps:
       - name: Install packages
-        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y google-chrome-stable <%= (dockerfile_deploy_packages + [build_package_for_database]).join(" ") %>
+        run: sudo apt-get update && sudo apt-get install --no-install-recommends -y google-chrome-stable <%= (dockerfile_base_packages + [build_package_for_database]).join(" ") %>
 
       - name: Checkout code
         uses: actions/checkout@v4

railties/test/fixtures/Dockerfile.test

@@ -7,21 +7,21 @@ FROM registry.docker.com/library/ruby:$RUBY_VERSION-slim as base
 # Rails app lives here
 WORKDIR /rails
 
+# Install base packages
+RUN apt-get update -qq && \
+    apt-get install --no-install-recommends -y curl libsqlite3-0 libvips
+
 # Set production environment
 ENV RAILS_ENV="production" \
     BUNDLE_DEPLOYMENT="1" \
     BUNDLE_PATH="/usr/local/bundle" \
     BUNDLE_WITHOUT="development"
 
-
 # Throw-away build stage to reduce size of final image
 FROM base as build
 
 # Install packages needed to build gems
-RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y build-essential git libvips pkg-config
-
-
+RUN apt-get install --no-install-recommends -y build-essential git pkg-config
 
 # Install application gems
 COPY Gemfile Gemfile.lock ./
@@ -29,8 +29,6 @@ RUN bundle install && \
     rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git && \
     bundle exec bootsnap precompile --gemfile
 
-
-
 # Copy application code
 COPY . .
 
@@ -40,14 +38,11 @@ RUN bundle exec bootsnap precompile app/ lib/
 # Precompiling assets for production without requiring secret RAILS_MASTER_KEY
 RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
 
-
 # Final stage for app image
 FROM base
 
-# Install packages needed for deployment
-RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y curl libsqlite3-0 libvips && \
-    rm -rf /var/lib/apt/lists /var/cache/apt/archives
+# Clean up installation packages to reduce image size
+RUN rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
 # Copy built artifacts: gems, application
 COPY --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"