refactor(docker): separate install step from source copy

Dockerfile

@@ -1,20 +1,24 @@
 # syntax=docker/dockerfile:1.7-labs
-
-# https://pnpm.io/docker
-FROM node:22.5.1-alpine3.20 AS base
+FROM node:22.5.1-alpine3.20 AS build
 ENV PNPM_HOME="/pnpm"
 ENV PATH="$PNPM_HOME:$PATH"
 RUN corepack enable pnpm
 WORKDIR /drap
-COPY . .
-RUN --mount=type=cache,id=pnpm,target=/pnpm/store pnpm install --frozen-lockfile
-
-FROM base AS build
+COPY pnpm-lock.yaml ./
+RUN pnpm fetch
+COPY . ./
+RUN pnpm install --recursive --offline
 RUN pnpm --parallel --recursive build
 RUN pnpm --filter=drap-email --prod deploy /prod/email
 RUN pnpm --filter=drap-app --prod deploy /prod/app
 
 FROM node:22.5.1-alpine3.20 AS deploy
-COPY --from=build /prod /prod
+COPY --from=build /prod/ /drap/
 EXPOSE 3000
-CMD tail -f /dev/null
+
+# This is the command to start the SvelteKit server. The background email worker
+# should be spawned as a separate process somehow. When deploying to Fly.io
+# (see the fly.toml), we use Process Groups to spawn both the main SvelteKit
+# server and the email worker at the same time. For the sake of supplying a
+# # default entry point, the following `CMD` starts the SvelteKit server.
+CMD ["node", "/prod/app/build/index.js"]

fly.toml

@@ -2,8 +2,8 @@ app = 'drap-app'
 primary_region = 'sin'
 
 [processes]
-app = 'node /prod/app/build/index.js'
-email = 'node --enable-source-maps /prod/email/dist/main.js'
+app = 'node /drap/app/build/index.js'
+email = 'node --enable-source-maps /drap/email/dist/main.js'
 
 [http_service]
 processes = ['app']