Try alpine

Dockerfile

@@ -3,7 +3,7 @@
 
 # Make sure RUBY_VERSION matches the Ruby version in .ruby-version
 ARG RUBY_VERSION=4.0.1
-FROM ruby:$RUBY_VERSION-slim AS base
+FROM ruby:$RUBY_VERSION-alpine AS base
 
 LABEL fly_launch_runtime="rails"
 
@@ -15,9 +15,7 @@ RUN gem update --system --no-document && \
     gem install -N bundler
 
 # Install base packages
-RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y curl libjemalloc2 postgresql-client && \
-    rm -rf /var/lib/apt/lists /var/cache/apt/archives
+RUN apk add --no-cache curl jemalloc postgresql-client tzdata
 
 # Set production environment
 ENV BUNDLE_DEPLOYMENT="1" \
@@ -30,19 +28,18 @@ ENV BUNDLE_DEPLOYMENT="1" \
 FROM base AS prebuild
 
 # Install packages needed to build gems and node modules
-RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y build-essential git libpq-dev libyaml-dev node-gyp pkg-config python-is-python3 && \
-    rm -rf /var/lib/apt/lists /var/cache/apt/archives
+RUN apk add --no-cache build-base git gyp libpq-dev pkgconfig python3 yaml-dev
 
 
 FROM prebuild AS node
 
 # Install Node.js
 ARG NODE_VERSION=24.14.0
 ENV PATH=/usr/local/node/bin:$PATH
-RUN curl -sL https://github.com/nodenv/node-build/archive/master.tar.gz | tar xz -C /tmp/ && \
-    /tmp/node-build-master/bin/node-build "${NODE_VERSION}" /usr/local/node && \
-    rm -rf /tmp/node-build-master
+RUN curl -sL https://unofficial-builds.nodejs.org/download/release/v${NODE_VERSION}/node-v${NODE_VERSION}-linux-x64-musl.tar.gz | tar xz -C /tmp/ && \
+    mkdir /usr/local/node && \
+    cp -rp /tmp/node-v${NODE_VERSION}-linux-x64-musl/* /usr/local/node/ && \
+    rm -rf /tmp/node-v${NODE_VERSION}-linux-x64-musl
 
 # Install node modules
 COPY package.json ./
@@ -79,17 +76,15 @@ RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
 FROM base
 
 # Install packages needed for deployment
-RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y gzip && \
-    rm -rf /var/lib/apt/lists /var/cache/apt/archives
+RUN apk add --no-cache gzip libpq
 
 # Copy built artifacts: gems, application
 COPY --from=build "${BUNDLE_PATH}" "${BUNDLE_PATH}"
 COPY --from=build /rails /rails
 
 # Run and own only the runtime files as a non-root user for security
-RUN groupadd --system --gid 1000 rails && \
-    useradd rails --uid 1000 --gid 1000 --create-home --shell /bin/bash && \
+RUN addgroup --system --gid 1000 rails && \
+    adduser --system rails --uid 1000 --ingroup rails --home /home/rails --shell /bin/sh rails && \
     chown -R 1000:1000 db log tmp
 USER 1000:1000
 

Gemfile.lock

@@ -164,6 +164,8 @@ GEM
     nio4r (2.7.5)
     nokogiri (1.19.1-aarch64-linux-gnu)
       racc (~> 1.4)
+    nokogiri (1.19.1-aarch64-linux-musl)
+      racc (~> 1.4)
     nokogiri (1.19.1-arm64-darwin)
       racc (~> 1.4)
     nokogiri (1.19.1-x86_64-linux-gnu)
@@ -177,6 +179,7 @@ GEM
       racc
     pg (1.6.3)
     pg (1.6.3-aarch64-linux)
+    pg (1.6.3-aarch64-linux-musl)
     pg (1.6.3-arm64-darwin)
     pg (1.6.3-x86_64-linux)
     pg (1.6.3-x86_64-linux-musl)
@@ -334,6 +337,7 @@ GEM
 
 PLATFORMS
   aarch64-linux
+  aarch64-linux-musl
   arm64-darwin
   x86_64-linux
   x86_64-linux-musl
@@ -420,6 +424,7 @@ CHECKSUMS
   net-smtp (0.5.1) sha256=ed96a0af63c524fceb4b29b0d352195c30d82dd916a42f03c62a3a70e5b70736
   nio4r (2.7.5) sha256=6c90168e48fb5f8e768419c93abb94ba2b892a1d0602cb06eef16d8b7df1dca1
   nokogiri (1.19.1-aarch64-linux-gnu) sha256=cfdb0eafd9a554a88f12ebcc688d2b9005f9fce42b00b970e3dc199587b27f32
+  nokogiri (1.19.1-aarch64-linux-musl) sha256=1e2150ab43c3b373aba76cd1190af7b9e92103564063e48c474f7600923620b5
   nokogiri (1.19.1-arm64-darwin) sha256=dfe2d337e6700eac47290407c289d56bcf85805d128c1b5a6434ddb79731cb9e
   nokogiri (1.19.1-x86_64-linux-gnu) sha256=1a4902842a186b4f901078e692d12257678e6133858d0566152fe29cdb98456a
   nokogiri (1.19.1-x86_64-linux-musl) sha256=4267f38ad4fc7e52a2e7ee28ed494e8f9d8eb4f4b3320901d55981c7b995fc23
@@ -428,6 +433,7 @@ CHECKSUMS
   parser (3.3.10.2) sha256=6f60c84aa4bdcedb6d1a2434b738fe8a8136807b6adc8f7f53b97da9bc4e9357
   pg (1.6.3) sha256=1388d0563e13d2758c1089e35e973a3249e955c659592d10e5b77c468f628a99
   pg (1.6.3-aarch64-linux) sha256=0698ad563e02383c27510b76bf7d4cd2de19cd1d16a5013f375dd473e4be72ea
+  pg (1.6.3-aarch64-linux-musl) sha256=06a75f4ea04b05140146f2a10550b8e0d9f006a79cdaf8b5b130cde40e3ecc2c
   pg (1.6.3-arm64-darwin) sha256=7240330b572e6355d7c75a7de535edb5dfcbd6295d9c7777df4d9dddfb8c0e5f
   pg (1.6.3-x86_64-linux) sha256=5d9e188c8f7a0295d162b7b88a768d8452a899977d44f3274d1946d67920ae8d
   pg (1.6.3-x86_64-linux-musl) sha256=9c9c90d98c72f78eb04c0f55e9618fe55d1512128e411035fe229ff427864009
@@ -489,4 +495,4 @@ RUBY VERSION
   ruby 4.0.1p0
 
 BUNDLED WITH
-  4.0.7
+  4.0.8

bin/docker-entrypoint

@@ -1,4 +1,4 @@
-#!/bin/bash -e
+#!/bin/sh -e
 
 # Enable jemalloc for reduced memory usage and latency.
 if [ -z "${LD_PRELOAD+x}" ]; then

config/dockerfile.yml

@@ -2,6 +2,7 @@
 
 ---
 options:
+  alpine: true
   bin-cd: true
   gemfile-updates: false
   label: