title: How to start docker build at a certain stage in a multi-stage build?
body: <p>Our application take a very long time to compile.  Any change to the Dockerfile triggers a full-recomplile (which takes a very long time)  The Dockerfile is a muli-stage build. I'm trying to work on the second stage.  Is there any way to tell <code>docker build</code> to begin at the second stage?</p>
  <pre><code>FROM debian:latest AS builder
  
  # 10-20 mins worth of stuff here
  
  FROM alpine:latest AS runner
  WORKDIR /
  
  COPY --from=builder /work/myapp.zip .
  RUN unzip myapp.zip -d /myapp
  
  # and more stuff that I'm working on here
  </code></pre>
  <p>Is there some way to do <code>docker build --begin-with runner</code>?</p>