Add linting

Adds linting and fixes a couple of linting issues. Closes #6.

.github/workflows/ci.yaml

@@ -22,3 +22,5 @@ jobs:
           VERSION: latest
       - name: Test
         run: make test
+      - name: Lint
+        run: make lint

Makefile

@@ -19,3 +19,7 @@ push:
 .PHONY: test
 test:
 	go test -v .
+
+.PHONY: lint
+lint:
+	docker run --rm -v $$(pwd):/app -w /app golangci/golangci-lint:v1.46.2 golangci-lint run -v

main.go

@@ -13,7 +13,7 @@ import (
 	"golang.org/x/oauth2"
 )
 
-func handleInterrupt(client *github.Client, ctx context.Context, apprv *approvalEnvironment) {
+func handleInterrupt(ctx context.Context, client *github.Client, apprv *approvalEnvironment) {
 	newState := "closed"
 	closeComment := "Workflow cancelled, closing issue."
 	fmt.Println(closeComment)
@@ -158,8 +158,8 @@ func main() {
 	select {
 	case exitCode := <-commentLoopChannel:
 		os.Exit(exitCode)
-	case _ = <-killSignalChannel:
+	case <-killSignalChannel:
-		handleInterrupt(client, ctx, apprv)
+		handleInterrupt(ctx, client, apprv)
 		os.Exit(1)
 	}
 }