feat: add linters (#11)

Reviewed-on: #11
Co-authored-by: Jan Klattenhoff <jan@kjan.email>
Co-committed-by: Jan Klattenhoff <jan@kjan.email>

.golangci.yml

@@ -0,0 +1,4 @@
+version: "2"
+linters:
+  enable:
+    - revive

internal/validation/validation.go

@@ -1,3 +1,4 @@
+// Package validation General validation tasks
 package validation
 
 import (
@@ -6,6 +7,7 @@ import (
 	"strings"
 )
 
+// ValidateConventionalCommit validates if string follows conventional commit
 func ValidateConventionalCommit(commit string) error {
 	// Regex to match the commit format
 	// type(scope)!: description

main.go

@@ -1,3 +1,4 @@
+// Package main is the main package
 package main
 
 import (
@@ -8,6 +9,7 @@ import (
 	"git.kjan.de/actions/pull-request-lint/internal/validation"
 )
 
+// GithubEvent represents a github actions event
 type GithubEvent struct {
 	PullRequest struct {
 		Title string `json:"title"`
@@ -26,7 +28,13 @@ func main() {
 		fmt.Printf("Error opening %s: %v\n", eventPath, err)
 		os.Exit(1)
 	}
-	defer eventFile.Close()
+	defer func() {
+		closeFileErr := eventFile.Close()
+		if closeFileErr != nil {
+			fmt.Println("Error closing eventFile")
+			os.Exit(1)
+		}
+	}()
 
 	var event GithubEvent
 	decoder := json.NewDecoder(eventFile)