use BUNDLE_PATH in COPY

dockerfiles/alpine.Dockerfile

@@ -1,43 +1,51 @@
 ARG RUBY_VERSION="3.4.3"
-FROM ruby:${RUBY_VERSION}-alpine AS base
+FROM docker.io/library/ruby:${RUBY_VERSION}-alpine AS base
 
-WORKDIR /app
+WORKDIR /kubernaut
 
 RUN <<EOT
-  apk update
+  apk update -q
+  apk add bash
+  rm -rf /var/cache/apk
   gem update --system --no-document
   gem install -N bundler
 EOT
 
+ENV RACK_ENV="production" \
+  BUNDLE_DEPLOYMENT=true \
+  BUNDLE_PATH="/usr/local/bundle" \
+  BUNDLE_WITHOUT="development test"
 
 FROM base AS build
 
-ENV BUNDLE_DEPLOYMENT=true \
-  BUNDLE_WITHOUT="development test"
-
 RUN <<EOT
   apk add musl-dev gcc make
+  rm -rf /var/cache/apk
 EOT
 
-COPY Gemfile* .
+COPY Gemfile Gemfile.lock ./
 
 RUN <<EOT
   bundle install
+  rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git
 EOT
 
+COPY . .
 
 FROM base
 
 ENV PORT=4567
 
-RUN adduser --home /app --disabled-password app
+RUN <<EOT
+  addgroup --system --gid 666 kubernaut
+  adduser --system --uid 666 --ingroup kubernaut --shell /bin/bash --disabled-password kubernaut
+EOT
 
-USER app:app
+COPY --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
+COPY --from=build /kubernaut /kubernaut
 
-COPY --from=build /usr/local/bundle /usr/local/bundle
-COPY --from=build --chown=app:app /app /app
-
-COPY --chown=app:app . .
+USER kubernaut:kubernaut
 
 EXPOSE $PORT
-CMD [ "puma" ]
+ENTRYPOINT [ "/kubernaut/dockerfiles/entrypoint.sh" ]
+CMD [ "bundle", "exec", "puma" ]

dockerfiles/bookworm.Dockerfile

@@ -1,44 +1,51 @@
 ARG RUBY_VERSION="3.4.3"
-FROM ruby:${RUBY_VERSION}-slim-bookworm AS base
+FROM docker.io/library/ruby:${RUBY_VERSION}-slim-bookworm AS base
 
-WORKDIR /app
+WORKDIR /kubernaut
 
 RUN <<EOT
-  apt-get update
+  apt-get update -qq
+  rm -rf /var/lib/apt/lists /var/cache/apt/archives
   gem update --system --no-document
   gem install -N bundler
 EOT
 
+ENV RACK_ENV="production" \
+  BUNDLE_DEPLOYMENT=true \
+  BUNDLE_PATH="/usr/local/bundle" \
+  BUNDLE_WITHOUT="development test"
 
 FROM base AS build
 
-ENV BUNDLE_DEPLOYMENT=true \
-  BUNDLE_WITHOUT="development test"
-
 RUN <<EOT
+  apt-get update -qq
   apt-get install --yes --no-install-recommends gcc make libc-dev
+  rm -rf /var/lib/apt/lists /var/cache/apt/archives
 EOT
 
-COPY Gemfile* .
+COPY Gemfile Gemfile.lock ./
 
 RUN <<EOT
   bundle install
+  rm -rf ~/.bundle/ "${BUNDLE_PATH}"/ruby/*/cache "${BUNDLE_PATH}"/ruby/*/bundler/gems/*/.git
 EOT
 
+COPY . .
 
 FROM base
 
 ENV PORT=4567
 
-# RUN useradd ruby --home /app --shell /bin/sh
-RUN useradd --home /app --create-home app
+RUN <<EOT
+  groupadd --system --gid 666 kubernaut
+  useradd --system --uid 666 --gid kubernaut --create-home --shell /bin/bash kubernaut
+EOT
 
-USER app:app
+COPY --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
+COPY --from=build /kubernaut /kubernaut
 
-COPY --from=build /usr/local/bundle /usr/local/bundle
-COPY --from=build --chown=app:app /app /app
-
-COPY --chown=app:app . .
+USER kubernaut:kubernaut
 
 EXPOSE $PORT
-CMD [ "puma" ]
+ENTRYPOINT [ "/kubernaut/dockerfiles/entrypoint.sh" ]
+CMD [ "bundle", "exec", "puma" ]

dockerfiles/entrypoint.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# output debugging info
+ruby --version
+printf "rubygems %s\n" "$(gem --version)"
+bundle version
+
+exec "${@}"