Dockerfile

# Foundation Target (install system runtime deps)
FROM xyz:1.0@sha256:abcd1234 AS foundation
# Runtime deps and common environment stuff here

# Build Target (install system buildtime deps)
FROM foundation AS build
# Install build-time systems deps and things here, we don’t want/need these in production

# Development Target (development toolchain)
FROM build AS development
# Install any big, dumb development tooling here, this is what you’re using locally

# Compile Target (static assets)
FROM build AS compile
# Any static compilation that needs to happen...

# Test Target (development + static assets)
FROM development AS test
# Copy files from compile target

# Production Gem Bundle Target (minimal bundle)
FROM build AS bundle
# Bundle the app for production, trim anything extra

# Production Target (minimal af)
FROM foundation AS production
# Copy files from bundle target
# Copy files from compile target