lint, and change test paths in CI

Makefile

@@ -48,4 +48,4 @@ test-frontend:
 	pnpm -F frontend "test:unit"
 
 test-backend:
-	go test -v -cover ./internal/api
+	go test -v -cover ./internal/...

internal/configuration_test.go

@@ -21,13 +21,12 @@ func TestConfig(t *testing.T) {
 	}
 	for _, tc := range testCases {
 		t.Run(tc.name, func(t *testing.T) {
-
 			if tc.name == "Should read config file successfully" {
 				f, err := os.Create("config.yaml")
 				if err != nil {
 					assert.NotNil(t, err)
 				}
-				defer os.Remove(f.Name())
+				defer os.Remove(f.Name()) //nolint: errcheck
 			} else {
 				err := os.Remove("config.yaml")
 				if err != nil {