Add linter and fix failing test case

Author: flixflop

.github/workflows/ci.yml

@@ -29,5 +29,19 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - name: Run formatting test
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.25.1"
+
+      - name: Check formatting
         run: test -z $(go fmt ./...)
+
+      - name: Install staticcheck
+        run: go install honnef.co/go/tools/cmd/staticcheck@latest 
+
+      - name: Run staticcheck 
+        run: staticcheck ./...

internal/auth/auth_test.go

@@ -1,7 +1,6 @@
 package auth
 
 import (
-	"fmt"
 	"net/http"
 	"testing"
 )
@@ -24,7 +23,6 @@ func TestGetAPIKey(t *testing.T) {
 	for _, tc := range tests {
 		got, err := GetAPIKey(tc.header)
 		if (err != nil) != tc.wantErr {
-			fmt.Sprintf("Got issue in test case %s", tc.name)
 			t.Fatalf("expected error: %v, got %v", tc.wantErr, err)
 		}
 		if got != tc.want {