Add log streamer

[gabriel-samfira]

This is a quality of life change that allows the operator to stream logs via web sockets. To enable this feature, you'll need to add:

[default]
# Enable streaming logs via web sockets. Use garm-cli debug-log.
enable_log_streamer = true

to your config file and restart garm.

After that, you can stream logs using garm-cli debug-log:

ubuntu@garm:/tmp$ garm-cli debug-log
2022/10/21 08:41:41 connecting to wss://webhooks.samfira.com/api/v1/ws
2022/10/21 08:41:41 10.198.117.1 - - [21/Oct/2022:08:41:41 +0000] "GET /api/v1/ws HTTP/1.1" 200 0 "" "Go-http-client/1.1"
2022/10/21 08:43:39 10.198.117.1 - - [21/Oct/2022:08:43:39 +0000] "GET /api/v1/instances HTTP/1.0" 200 773 "" "go-resty/2.7.0 (https://github.com/go-resty/resty)"