golangci: enable additional checks

.github/workflows/linter.yml

@@ -16,6 +16,3 @@ jobs:
       uses: golangci/golangci-lint-action@v2
       with:
         version: v1.31
-
-    - name: Run go fmt
-      run: diff -u <(echo -n) <(gofmt -d -s .)

.golangci.yml

@@ -0,0 +1,6 @@
+linters:
+  enable:
+    - goimports
+    - stylecheck
+    - misspell
+    - whitespace

data_test.go

@@ -209,5 +209,4 @@ func TestNewRequest_BaseURL(t *testing.T) {
 	if got := r.String(); got != want {
 		t.Errorf("NewRequest(%v, %v) returned %q, want %q", req, base, got, want)
 	}
-
 }

imageproxy_test.go

@@ -110,7 +110,6 @@ func TestCopyHeader(t *testing.T) {
 		if !reflect.DeepEqual(got, tt.want) {
 			t.Errorf("copyHeader(%v, %v, %v) returned %v, want %v", tt.dst, tt.src, tt.keys, got, tt.want)
 		}
-
 	}
 }