Copy bun's executable from official image instead of installing

Author: luizkowalski

lib/generators/templates/Dockerfile.erb

@@ -71,6 +71,15 @@ FROM prebuild AS <% if using_bun? %>bun<% else %>node<% end %>
 
 <% end -%>
 <% if using_bun? and (!using_execjs? || File.exist?('bun.lockb') || File.exist?('bun.lock')) -%>
+<% if bun_version -%>
+ARG BUN_VERSION=<%= bun_version %>
+<% end -%>
+<% if options.alpine? -%>
+FROM oven/bun:<%= bun_version ? '${BUN_VERSION}' : '1' %>-alpine AS bun
+<% else -%>
+FROM oven/bun:<%= bun_version ? '${BUN_VERSION}' : '1' %>-debian AS bun
+<% end -%>
+
 <%= render partial: 'install_node', locals: {bun_version: using_execjs? ? nil : bun_version} %>
 
 <% elsif using_node? and (!using_execjs? || File.exist?('yarn.lock')) -%>

lib/generators/templates/_install_node.erb

@@ -1,11 +1,7 @@
 <% if using_bun? -%>
-# Install Bun
-<% if bun_version -%>
-ARG BUN_VERSION=<%= bun_version %>
-<% end -%>
-ENV BUN_INSTALL=/usr/local/bun
-ENV PATH=/usr/local/bun/bin:$PATH
-RUN curl -fsSL https://bun.sh/install | bash<% if bun_version %> -s -- "bun-v${BUN_VERSION}"<% end %>
+# Copy Bun from official image
+COPY --from=bun /usr/local/bin/bun /usr/local/bin/bun
+ENV PATH=/usr/local/bin:$PATH
 <% else -%>
 <% if node_version and yarn_version -%>
 # Install JavaScript dependencies

test/results/bun/Dockerfile

@@ -38,11 +38,12 @@ RUN apt-get update -qq && \
     apt-get install --no-install-recommends -y build-essential libyaml-dev pkg-config unzip && \
     rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
-# Install Bun
 ARG BUN_VERSION=xxx
-ENV BUN_INSTALL=/usr/local/bun
-ENV PATH=/usr/local/bun/bin:$PATH
-RUN curl -fsSL https://bun.sh/install | bash -s -- "bun-v${BUN_VERSION}"
+FROM oven/bun:${BUN_VERSION}-debian AS bun
+
+# Copy Bun from official image
+COPY --from=bun /usr/local/bin/bun /usr/local/bin/bun
+ENV PATH=/usr/local/bin:$PATH
 
 # Install application gems
 COPY Gemfile Gemfile.lock ./