Simple stubbed ruby builder

build/Dockerfile.ruby-builder

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+# Multi-platform Dockerfile for Ruby builds
+# Uses menci/archlinuxarm which supports both amd64 and arm64
+FROM menci/archlinuxarm:latest
+
+# Initialize pacman keyring (needed for ALARM, harmless for Arch)
+RUN pacman-key --init && pacman-key --populate
+
+# Update package database and install only necessary packages (skip full system upgrade to avoid slow downloads)
+RUN pacman -Sy --noconfirm && \
+    pacman -S --noconfirm --needed git curl sudo ca-certificates openssl zlib libyaml libffi readline ncurses base-devel jq && \
+    pacman -Scc --noconfirm
+
+# Set mise environment variables for a consistent, container-friendly path
+ENV MISE_DATA_DIR=/mise
+ENV MISE_CONFIG_DIR=/mise
+ENV MISE_CACHE_DIR=/mise/cache
+ENV MISE_INSTALL_PATH=/usr/local/bin/mise
+ENV PATH=/mise/shims:$PATH
+
+# Install mise
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+RUN curl https://mise.run | sh
+
+# Set Ruby build options for relocatable/portable compilation
+ENV MISE_RUBY_BUILD_OPTS="--enable-load-relative --with-static-linked-ext"
+
+# Copy the build script
+COPY build-ruby.sh /build/build-ruby.sh
+RUN chmod +x /build/build-ruby.sh
+
+# Default command
+CMD ["/build/build-ruby.sh"]

build/build-ruby.sh

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+#!/bin/bash
+# Build script for Ruby + Rails bundles
+set -e
+
+# Check required environment variables
+if [[ -z "$RUBY_VERSION" ]]; then
+  echo "Error: RUBY_VERSION environment variable is required"
+  exit 1
+fi
+
+if [[ -z "$RAILS_VERSION" ]]; then
+  echo "Error: RAILS_VERSION environment variable is required"
+  exit 1
+fi
+
+if [[ -z "$ARCH" ]]; then
+  echo "Error: ARCH environment variable is required"
+  exit 1
+fi
+
+OUTPUT_DIR="/output/ruby/$ARCH"
+mkdir -p "$OUTPUT_DIR"
+
+echo "==> Ruby Bundle Builder"
+echo "==> Ruby version: $RUBY_VERSION"
+echo "==> Rails version: $RAILS_VERSION"
+echo "==> Architecture: $ARCH"
+echo "==> Output directory: $OUTPUT_DIR"
+
+# Handle special Ruby versions
+if [[ "$RUBY_VERSION" == "edge" ]]; then
+  echo "==> Installing Ruby edge from git..."
+  # mise can install Ruby from git
+  mise install ruby@ref:master
+  RUBY_INSTALL_VERSION="ref:master"
+  TARBALL_VERSION="edge"
+else
+  echo "==> Installing Ruby $RUBY_VERSION..."
+  mise install "ruby@$RUBY_VERSION"
+  RUBY_INSTALL_VERSION="$RUBY_VERSION"
+  TARBALL_VERSION="$RUBY_VERSION"
+fi
+
+# Activate Ruby
+echo "==> Activating Ruby..."
+mise use "ruby@$RUBY_INSTALL_VERSION"
+
+# Verify Ruby is working
+echo "==> Ruby version check:"
+ruby --version
+
+# Find the actual Ruby installation directory
+if [[ "$RUBY_INSTALL_VERSION" == "ref:master" ]]; then
+  # For edge builds, find the directory (it will have a hash name)
+  RUBY_DIR=$(ls -d /mise/installs/ruby/ref-* | head -1 | xargs basename)
+else
+  RUBY_DIR="$RUBY_INSTALL_VERSION"
+fi
+
+# Set up gem paths for relocatable installation
+export GEM_HOME="/mise/installs/ruby/$RUBY_DIR/lib/ruby/gems"
+export GEM_PATH="$GEM_HOME"
+export BUNDLE_PATH="$GEM_HOME"
+mkdir -p "$GEM_HOME"
+
+echo "==> Gem environment:"
+echo "    GEM_HOME: $GEM_HOME"
+echo "    GEM_PATH: $GEM_PATH"
+
+# Install Rails
+echo "==> Installing Rails $RAILS_VERSION..."
+if [[ "$RAILS_VERSION" == "edge" ]]; then
+  gem install rails --pre
+  # Get the actual version installed
+  RAILS_ACTUAL_VERSION=$(gem list rails | grep "^rails " | sed 's/rails (\(.*\))/\1/')
+  TARBALL_RAILS_VERSION="edge-$RAILS_ACTUAL_VERSION"
+else
+  gem install rails --version "$RAILS_VERSION"
+  TARBALL_RAILS_VERSION="$RAILS_VERSION"
+fi
+
+# Verify Rails is installed
+echo "==> Rails version check:"
+rails --version
+
+# Generate a temporary Rails app to install default gems
+echo "==> Generating temporary Rails app to install default gems..."
+rails new temp_app --skip-git --skip-bundle
+cd temp_app
+
+# Install all the default gems to our GEM_HOME
+bundle install
+
+# Show installed gems count
+echo "==> Installed gems:"
+gem list | wc -l
+
+# Clean up
+cd /
+rm -rf temp_app
+
+# Create the tarball with proper naming
+TARBALL_NAME="ruby-${TARBALL_VERSION}-rails-${TARBALL_RAILS_VERSION}-${ARCH}.tar.gz"
+TARBALL_PATH="$OUTPUT_DIR/$TARBALL_NAME"
+
+echo "==> Creating tarball: $TARBALL_NAME"
+
+# Create the tarball including Ruby binaries and all gems
+echo "    Including Ruby installation and gems..."
+tar -czf "$TARBALL_PATH" -C /mise/installs/ruby "$RUBY_DIR"
+
+# Show file info
+echo "==> Tarball created:"
+ls -lh "$TARBALL_PATH"
+
+echo "==> Build complete!"