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Install node modules before copying over your working code so that node_modules are built (and cached) before you change your service code!
# ...
ADD package.json /tmp/package.json
RUN cd /tmp && npm install && \
mkdir -p /opt/app && cp -a /tmp/node_modules /opt/app/
# ...
WORKDIR /opt/app
ADD . /opt/app
@rationull
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For those like myself who were initially bewildered by this, the "Build cache" section of the Dockerfile best practices doc may help fill in the gaps.

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