Adding a docker-based dev env #97046

Job	Run time
Determine tests matrix	1m 10s
E2E: Build jetpack-boost	3m 27s
E2E: Build jetpack-core	4m 11s
E2E: Build jetpack-search	4m 10s
E2E: Build jetpack-social	4m 30s
E2E: Build jetpack-sync	4m 19s
E2E: Build jetpack-videopress	3m 0s
Jetpack connection e2e tests	6m 31s
Jetpack pre-connection e2e tests	3m 10s
Jetpack post-connection e2e tests	5m 38s
Jetpack post editor e2e tests	3m 16s
Jetpack sync e2e tests	4m 9s
Jetpack Boost - Base e2e tests	14m 59s
Jetpack Boost - Modules e2e tests	4m 14s
Jetpack Boost - Critical CSS e2e tests	3m 54s
Jetpack Boost - Page Cache e2e tests	3m 59s
Jetpack Boost - Concatenate JS and CSS e2e tests	3m 37s
Jetpack Boost - Image CDN e2e tests	4m 20s
Jetpack Boost - Image Guide e2e tests	3m 6s
Search e2e tests	4m 19s
VideoPress e2e tests	2m 58s
Social e2e tests	5m 10s
Slack notification	3m 3s
Test report	2s
	1h 41m 12s

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