Add a relatively minimal set of linters that raise safe and
mostly un-opinionated issues with the code. It runs
automatically on CI via a github action.
* Add safe mkdirall and open
* Use secure as much as possible and merge gomodules for orbit to fleet
* Improve openfile and mkdirall to check for permissiveness instead of equality
* Don't shift
* Fix links
* Address review comments
Adds endpoints and fleetctl commands to retrieve various debug profiles
from the Fleet server.
The best summary is from the help text:
```
fleetctl debug
NAME:
fleetctl debug - Tools for debugging Fleet
USAGE:
fleetctl debug command [command options] [arguments...]
COMMANDS:
profile Record a CPU profile from the Fleet server.
cmdline Get the command line used to invoke the Fleet server.
heap Report the allocated memory in the Fleet server.
goroutine Get stack traces of all goroutines (threads) in the Fleet server.
trace Record an execution trace on the Fleet server.
archive Create an archive with the entire suite of debug profiles.
OPTIONS:
--config value Path to the Fleet config file (default: "/Users/zwass/.fleet/config") [$CONFIG]
--context value Name of Fleet config context to use (default: "default") [$CONTEXT]
--help, -h show help
```
