This patch:
- updates docker seccomp profile to use a slightly modified default docker
profile
- removes SUID sandbox documentation since it doesn't seem to work
References #2745
This patch bakes browsers into docker image.
Important observations:
- We now re-build docker image everytime we roll browsers.
- Docker image size almost doubles: from `225MB` to `496MB`.
References #2926
Has some overlaps with the troubleshooting doc, which I plan to clean up in a subsequent PR. This first version of the doc has a feel of "build-your-own" with our sample configurations. Over time we can tweak the level of hand-holding for the best user experience to get started with CI.
Fixes#1103
