Add Go code analyzer workflow

.github/workflows/code-analyzer.yml

@@ -0,0 +1,58 @@
+name: Go Code Analyzer
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "**.go"
+      - go.mod
+      - go.sum
+      - ".github/workflows/code-analyzer.yml"
+  pull_request:
+    branches:
+      - main
+    paths:
+      - "**.go"
+      - go.mod
+      - go.sum
+      - ".github/workflows/code-analyzer.yml"
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: Analyze Go code
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v6
+
+      - name: Set up Go
+        uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Check formatting
+        run: |
+          unformatted=$(gofmt -l .)
+          if [ -n "$unformatted" ]; then
+            echo "These files are not gofmt-formatted:"
+            echo "$unformatted"
+            exit 1
+          fi
+
+      - name: Run go vet
+        run: go vet ./...
+
+      - name: Run staticcheck
+        uses: dominikh/staticcheck-action@v1
+        with:
+          version: "latest"
+          install-go: false
+
+      - name: Run tests
+        run: go test -race -shuffle=on ./...

web/controller/index.go

@@ -1,10 +1,10 @@
 package controller
 
 import (
+	"fmt"
 	"net/http"
 	"text/template"
 	"time"
-	"fmt"
 
 	"github.com/mhsanaei/3x-ui/v2/logger"
 	"github.com/mhsanaei/3x-ui/v2/web/service"