Use docker/build-push-action to cache docker build #1696
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alastair
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Description
Now that we use docker buildx in the unit tests, use the
docker/build-push-actionto allow us to use docker's built-in layer cache when running tests.This also builds the base image manually instead of using
make, as the makefile now contains both the py2 and py3 base images and we only need the py3 one.I manually build the worker image (to cache it), and then run docker-compose build again to correctly tag it. Theoretically this should use existing layers and then tag the image as expected.
I use 2 "cache images" in the github docker cache. This should make the caching operation quite fast because it stays within github instead of going to docker hub.