switch to Debian bookworn Ruby image

Dockerfile

@@ -1,19 +1,19 @@
-FROM ruby:alpine AS base
+ARG RUBY_VERSION="3.4.3"
+FROM ruby:${RUBY_VERSION} AS base
 
 WORKDIR /app
 
 RUN <<EOT
+  apt-get update
   gem update --system --no-document
   gem install -N bundler
-  apk update
-  apk upgrade --no-cache
 EOT
 
 
 FROM base AS build
 
 RUN <<EOT
-  apk add gcc musl-dev ruby-dev make
+  apt-get install --yes gcc make
 EOT
 
 COPY Gemfile* .
@@ -27,14 +27,14 @@ EOT
 FROM base
 
 # RUN useradd ruby --home /app --shell /bin/sh
-RUN adduser ruby -h /app -D
+RUN useradd --home /app --create-home app
 
-USER ruby:ruby
+USER app:app
 
 COPY --from=build /usr/local/bundle /usr/local/bundle
-COPY --from=build --chown=ruby:ruby /app /app
+COPY --from=build --chown=app:app /app /app
 
-COPY --chown=ruby:ruby . .
+COPY --chown=app:app . .
 
 EXPOSE 4567
 CMD [ "bundle", "exec", "rackup", "--host", "0.0.0.0", "--port", "4567" ]