It turns out Github Actions have docker pre-installed.
This patch unifies the codepaths that we use to build docker image
locally and to publish it from CI.
As a result, there's no extra `--prepare-context` argument in
`//docs/docker/build.sh` that was used solely on CI.
References #2926
Everytime I sync my fork to upstream, I get failure notifications:
```
Run failed for master (3edfb2a)
Repository: rwoll/playwright
Workflow: devrelease
Duration: 10 minutes and 34.0 seconds
Finished: 2020-07-31 18:30:13 UTC
```
Since forks should never have the necessary secrets to publish
the npm and Docker packages, we limit the running of these jobs to avoid
noisy failures for contributors.
We currently tag tip-of-tree docker images with `dev` tag. It'll
be much nicer to have consistent taggin with our `npm` which tags
with `next` tag.
This patch removes the `dev` tag and starts using the `next` tag instead
for docker images. Since we haven't announced `dev` tag support
anywhere, I think it's fine to remove it rather than have both `next`
and `dev`.
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
- Repository name has to start with `public/` to be exported to dockerhub.
- Remove `DOCKER_USERNAME` to avoid unnecessary masking in our logs.
- Publish dev versions of Docker image only when changes to docker file
happen. (this is why NPM publishing and Docker publishing for dev
releases are now separate).
- Release publishing in two separate jobs to make them independent.
References #2926
