Production build at container run time

.dockerignore

@@ -2,6 +2,7 @@
 node_modules
 
 # Ignore common folders that we do not need
+.git
 .next
 .github
 .vscode

Dockerfile

@@ -1,6 +1,7 @@
 FROM docker.io/library/node:18-alpine AS build-env
 
-# Disable telemetry
+ENV NODE_ENV production
+ENV PORT 3000
 ENV NEXT_TELEMETRY_DISABLED 1
 
 WORKDIR /app
@@ -15,23 +16,5 @@ RUN npm install
 # Copy files. Use dockerignore to avoid copying node_modules
 COPY . .
 
-# Build
-RUN npm run build
-
-# Running the app
-FROM gcr.io/distroless/nodejs:18 AS runner
-WORKDIR /app
-
-# Mark as prod, disable telemetry, set port
-ENV NODE_ENV production
-ENV PORT 3000
-ENV NEXT_TELEMETRY_DISABLED 1
-
-# Copy from build
-COPY --from=build-env /app/next.config.mjs ./
-COPY --from=build-env /app/public ./public
-COPY --from=build-env /app/.next ./.next
-COPY --from=build-env /app/node_modules ./node_modules
-
 # Run app command
-CMD ["./node_modules/next/dist/bin/next", "start"]
+CMD ["/bin/ash", "/app/entrypoint.sh"]

entrypoint.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+# The build step hard-codes variables from the environment into HTML, so it must
+# be done with the correct .env.local for runtime.
+
+./node_modules/next/dist/bin/next build
+./node_modules/next/dist/bin/next start