Fix local go_lintfix errors (docker#5191)

nicksieger · ndeloof · commit ab84b6ac5b9a · 2023-02-02T14:59:30.000+01:00
* lint: add make lintfix and run it

Fixes all errors like:
```
File is not `goimports`-ed with -local github.com/tilt-dev/tilt (goimports)
```

* git: change to use TrimSuffix

* build: remove unnecessary cast
diff --git a/pkg/watch/watcher_nonwin.go b/pkg/watch/watcher_nonwin.go
@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 package watch

Original file line number	Diff line number	Diff line change
`@@ -1,3 +1,4 @@`
	`1`	`+//go:build !windows`
`1`	`2`	`// +build !windows`
`2`	`3`
`3`	`4`	`package watch`