Dockerfile

# Build stage
FROM elixir:1.15-alpine AS builder

# Install build dependencies
RUN apk add --no-cache build-base git

# Set environment variables
ENV MIX_ENV=prod

# Create app directory
WORKDIR /app

# Install hex and rebar
RUN mix local.hex --force && \
    mix local.rebar --force

# Copy mix files
COPY mix.exs ./

# Install dependencies
RUN mix deps.get --only prod
RUN mix deps.compile

# Copy source code
COPY . .

# Compile assets
RUN mix assets.deploy

# Compile the application
RUN mix compile

# Create release
RUN mix release

# Runtime stage
FROM alpine:3.18

# Install runtime dependencies
RUN apk add --no-cache \
    openssl \
    ncurses-libs \
    libgcc \
    libstdc++

# Create non-root user
RUN adduser -D -s /bin/sh app

# Set working directory
WORKDIR /app

# Copy release from builder stage
COPY --from=builder --chown=app:app /app/_build/prod/rel/simple_elixir_app ./

# Switch to non-root user
USER app

# Expose port
EXPOSE 4000

# Set environment
ENV MIX_ENV=prod
ENV PORT=4000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:4000/ || exit 1

# Start the application
CMD ["./bin/simple_elixir_app", "start"]