Dockerfile for building

Dockerfile

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+# syntax=docker/dockerfile:1.7
+
+# Use the official Alpine Elixir image; keep the version in sync with mix.exs
+ARG ELIXIR_VERSION=1.15
+FROM elixir:${ELIXIR_VERSION}-alpine AS build
+
+ENV LANG="en_US.UTF-8" \
+    MIX_ENV="prod" \
+    HOME="/app"
+
+WORKDIR /app
+
+RUN apk update && \
+    apk add --no-cache \
+    build-base \
+    sqlite-dev \
+    openssl-dev \
+    ca-certificates
+
+RUN mix do local.hex --force, local.rebar --force
+
+# Only copy files necessary to download deps to maximize layer caching
+COPY mix.exs mix.lock ./
+COPY config config
+
+RUN mix deps.get --only ${MIX_ENV} && \
+    mix deps.compile
+
+# Copy the rest of the application source
+COPY lib lib
+COPY priv priv
+COPY assets assets
+
+RUN mix compile
+RUN mix assets.deploy
+RUN mix release
+
+# Minimal runtime image
+FROM alpine:3.19 AS app
+
+ENV LANG="en_US.UTF-8" \
+    MIX_ENV="prod" \
+    PORT="4000" \
+    PHX_SERVER="true" \
+    DATABASE_PATH="/app/data/action_requests_demo.db"
+
+WORKDIR /app
+
+RUN apk add --no-cache \
+    openssl \
+    ncurses-libs \
+    libstdc++ \
+    sqlite \
+    ca-certificates
+
+# Keep SQLite data outside of the release directory so it can persist as a volume
+RUN install -d -m 0755 /app/data
+
+COPY --from=build /app/_build/prod/rel/action_requests_demo ./
+
+RUN addgroup -S app && \
+    adduser -S app -G app && \
+    chown -R app:app /app
+
+USER app
+
+EXPOSE 4000
+VOLUME ["/app/data"]
+
+ENTRYPOINT ["./bin/action_requests_demo"]
+CMD ["start"]
+