FROM node:22-slim AS base
ENV PNPM_HOME="/pnpm"
ENV PATH="$PNPM_HOME:$PATH"
RUN corepack enable


# use Docker layers as the build cache instead of the local pnpm cache (I chose this method because this works in all environments, even ephemeral Github Actions VMs):
FROM base AS prod
WORKDIR /app
COPY pnpm-lock.yaml /app
RUN pnpm fetch --prod
COPY . /app
RUN pnpm run build


FROM base AS final
WORKDIR /app
COPY --from=prod /app/node_modules /app/node_modules
COPY --from=prod /app/dist /app
EXPOSE 4321
# set the host to 0.0.0.0 so that it can be accessed from outside the container (doesn't work without this, even with the `-p 4321:4321` docker option):
ENV HOST="0.0.0.0"
CMD [ "node", "server/entry.mjs" ]