fix(lint): fix failing lints, add Docker command to Makefile, closes #24

Makefile

@@ -19,6 +19,8 @@ all:
 	@echo ""
 	@echo "  fmt: run go fmt on the repository"
 	@echo ""
+	@echo "  lint: run Docker golang-lint-ci for the repository"
+	@echo ""
 	@echo "  install-hooks: install git-hooks in the cloned repo .git directory"
 	@echo ""
 
@@ -40,6 +42,9 @@ test:
 fmt:
 	go fmt ./...
 
+lint:
+	docker run --rm -v $(shell pwd):/app -w /app golangci/golangci-lint:v1.44.0 golangci-lint run  ./... -v
+
 install-hooks:
 	@echo "installing git hooks"
 	cp ./hack/hooks/* .git/hooks/

api/main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"encoding/json"
 	"fmt"
+	"log"
 	"net/http"
 	"time"
 
@@ -24,7 +25,10 @@ func languagesHandler(w http.ResponseWriter, r *http.Request) {
 	langs := LanguagesResponse{
 		Languages: coderunner.Languages,
 	}
-	json.NewEncoder(w).Encode(langs)
+	err := json.NewEncoder(w).Encode(langs)
+	if err != nil {
+		log.Printf("failed to encode languages reponse: %v", err)
+	}
 }
 
 type RunResponse struct {
@@ -45,7 +49,10 @@ func runHandler(w http.ResponseWriter, r *http.Request) {
 		Stderr: "",
 	}
 
-	json.NewEncoder(w).Encode(output)
+	err := json.NewEncoder(w).Encode(output)
+	if err != nil {
+		log.Printf("failed to encode run output: %v\n", err)
+	}
 }
 
 func main() {

engine/coderunner/runner_test.go

@@ -11,11 +11,6 @@ import (
 )
 
 func TestCodeRunner_Run(t *testing.T) {
-	type fields struct {
-		runner      runtime.Runtime
-		workdirPath string
-	}
-
 	type args struct {
 		props *RunnerProps
 	}

readme.md

@@ -94,6 +94,9 @@ make test
 # run go fmt on the repository to format your code
 make fmt
 
+# run the golang-lint-ci on the package to find common mistakes or unused data structures
+make lint
+
 # install git-hooks to automatically format your code before you commit
 make install-hooks
 ```