chore: try caching

Author: rokroskar

.github/workflows/build-global-renkulab-images.yml

@@ -50,4 +50,5 @@ jobs:
           RUN_IMAGE=${{ env.RUN_IMAGE }} \
           BUILDER=${{ env.BUILDER_IMAGE }} \
           PUBLISH=1 \
+          EXTRA_FLAGS="--cache-image ${{ env.DOCKER_PREFIX }}/py-${{ matrix.FLAVOR }}-${{ matrix.FRONTEND }}-cache:latest" \
           make -C global-images ${{ matrix.FLAVOR }}

global-images/Makefile

@@ -29,3 +29,4 @@ basic datascience:
 		--env BP_RENKU_FRONTENDS=$(FRONTEND) \
 		--tag $$TAGS \
 		$$PUBLISH_FLAG \
+		$$EXTRA_FLAGS