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Docker & npm install not every image build

Simple but effective. If you copy just the package.json and run npm install in one step Docker will invalidate its own cache only if the file changes.

FROM node:lts-alpine as build


# Installing `node_modules` only if package.json has changed
COPY ./package.json ./package-lock.json .
RUN npm ci

# Copy the rest and build the thing
COPY . .
RUN npm run build

FROM nginx:latest as site
COPY --from=build /public /var/www/html
ADD /nginx.conf /etc/nginx/nginx.conf

EXPOSE 80/tcp