* fix: Add reaper to coder agent
- The coder agent runs as PID 1 in some of our Docker workspaces.
In such cases it is the responsibility of the init process to
reap dead processes. Failing to do so can result in an inability
to create new processes by running out of PIDs.
This PR adds a reaper to our agent that is only spawned if it
detects that it is PID1.
* fix: Update GIT_COMMITTER_NAME to use username
This was a mistake when adding the committer fields 🤦.
* fix: Use environment variables for agent authentication
Using files led to situations where running "coder server --dev" would
break `gitssh`. This is applicable in a production environment too. Users
should be able to log into another Coder deployment from their workspace.
Users can still set "CODER_URL" if they'd like with agent env vars!
* feat: Add web terminal with reconnecting TTYs
This adds a web terminal that can reconnect to resume sessions!
No more disconnects, and no more bad bufferring!
* Add xstate service
* Add the webpage for accessing a web terminal
* Add terminal page tests
* Use Ticker instead of Timer
* Active Windows mode on Windows
