chore: e2e improve docker cache (#16) #101

Job	Run time
e2e-docker-build-babylon	2m 39s
e2e-docker-build-babylon-before-upgrade	2m 59s
e2e-docker-build-e2e-init-chain	2m 29s
docker_pipeline / docker_build	2m 53s
lint_test / build	43s
lint_test / check-mock-gen	0s
lint_test / integration-tests	0s
lint_test / lint	3m 51s
lint_test / unit-tests	5m 21s
e2e-run-btc-timestamping-phase-2-rly	5m 1s
e2e-run-btc-timestamping-phase-2-hermes	5m 33s
e2e-run-btc-staking	4m 57s
e2e-run-btc-timestamping	5m 19s
e2e-run-ibc-transfer	5m 30s
docker_pipeline / dockerhub_publish	0s
docker_pipeline / ecr_publish	0s
e2e-run-upgrade-vanilla	3m 54s
	51m 9s

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