Only create group inside container when it doesn't exist yet and add wkhtmltopdf

Dockerfile

@@ -127,7 +127,7 @@ RUN ln -s /opt/sonar-scanner-4.7.0.2747-linux/bin/sonar-scanner /usr/bin/sonar-s
 # Protobuf
 RUN apt-get -y update && DEBIAN_FRONTEND=noninteractive apt-get -y install protobuf-compiler
 
-RUN apt-get -y update && DEBIAN_FRONTEND=noninteractive apt-get -y install html2text
+RUN apt-get -y update && DEBIAN_FRONTEND=noninteractive apt-get -y install html2text wkhtmltopdf
 
 ADD . /opt/workspace-repo
 WORKDIR /opt/workspace-repo

main.go

@@ -76,23 +76,30 @@ func AddUser(username string, uid string) error {
 }
 
 func AddGroup(name string, gid string) error {
-	cmd := exec.Command(
-		"groupadd",
-		"--gid", gid,
-		name,
-	)
-
-	output, err := cmd.CombinedOutput()
+	_, err := user.LookupGroupId(gid)
 	if err != nil {
-		return fmt.Errorf(
-			"Error adding group: %w. Process error: %w. Process output: %s",
-			ErrAddGroupFailExit,
-			err,
-			output,
-		)
+		if _, ok := err.(*user.UnknownGroupError); ok {
+			cmd := exec.Command(
+				"groupadd",
+				"--gid", gid,
+				name,
+			)
+
+			output, err := cmd.CombinedOutput()
+			if err != nil {
+				return fmt.Errorf(
+					"Error adding group: %w. Process error: %w. Process output: %s",
+					ErrAddGroupFailExit,
+					err,
+					output,
+				)
+			}
+
+			return nil
+		}
 	}
 
-	return nil
+	return err
 }
 
 const osDarwin = "darwin"