golangci-lint configuration file

golangci-lint can run all the currently enabled linters, and as far as I
can tell, does it in under 5 seconds as opposed to over 180 seconds
(compare `time make cilint` and `time make lint`).

Some of the linters that are listed in the "enabled" section but
commented out looked like a good idea to me, and fairly low hanging
fruit to fix, but they are not passing at the moment.

All the linters covered in the current Makefile are run.

TODO:
- replace lint target in Makefile with golangci-lint
- remove .github/workflow/errcheck.yml

modules/jenkins/widget.go

@@ -82,7 +82,7 @@ func (widget *Widget) content() (string, string, bool) {
 		row := fmt.Sprintf(
 			`[%s] [%s]%-6s[white]`,
 			widget.RowColor(idx),
-			widget.jobColor(&job),
+			widget.jobColor(job),
 			jobName,
 		)
 
@@ -92,7 +92,7 @@ func (widget *Widget) content() (string, string, bool) {
 	return title, str, false
 }
 
-func (widget *Widget) jobColor(job *Job) string {
+func (widget *Widget) jobColor(job Job) string {
 	switch job.Color {
 	case "blue":
 		// Override color if successBallColor boolean param provided in config