feat: use docker in frontend GHA to parallelize work

[mistercrunch]

Trying to do a proof of concept of using docker containers to 1. build the image first and 2. parallelize steps leveraging the image build.

So far, we save work but pushing/pulling the artifact seem to eat up some time. Less work overall but maybe a bit long depending. Lean images will be key here, and our images are pretty large given all the dependancies.

Notes:

• docker build takes about 4 minutes
• upload/download across workflows takes bout 2-3 minutes of overhead adding to linear time
• can run everything in parallel
• looking at --shard for jest, requires merging coverage files after done...