refactor(docker): introduce src-imported stage #4709
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Description
This PR adds the
src-imported
stage to the top stage of theDockerfile
.This allows the
base
andsrc-imported
stages to be processed in parallel, reducing the download latency of thevcs import
command. It also eliminates the need to run thevcs import
command again in theruntime
stage.The trial in my local environment speeded up the
docker build
by about 5 minutes.This PR does not cut out
rosdep install
, based on the reflection of the previous PR:#4656 (comment)
Tests performed
Not applicable.
Effects on system behavior
Not applicable.
Interface changes
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