feat: Check for new version of the CLI when running commands

Signed-off-by: Arthur Amstutz <arthur.amstutz@corp.ovh.com>

Author: amstuta

internal/cmd/root.go

@@ -7,6 +7,8 @@ package cmd
 import (
 	"encoding/json"
 	"fmt"
+	"log"
+	"net/http"
 	"os"
 
 	"github.com/spf13/cobra"
@@ -16,7 +18,8 @@ import (
 	"github.com/ovh/ovhcloud-cli/internal/config"
 	"github.com/ovh/ovhcloud-cli/internal/display"
 	"github.com/ovh/ovhcloud-cli/internal/flags"
-	"github.com/ovh/ovhcloud-cli/internal/http"
+	httplib "github.com/ovh/ovhcloud-cli/internal/http"
+	"github.com/ovh/ovhcloud-cli/internal/version"
 )
 
 // rootCmd represents the base command when called without any subcommands
@@ -117,15 +120,39 @@ Examples:
 	rootCmd.MarkFlagsMutuallyExclusive("json", "yaml", "interactive", "format")
 
 	rootCmd.PersistentPreRun = func(cmd *cobra.Command, args []string) {
-		if http.Client == nil {
+		// Check if a new version is available in a separate goroutine
+		go func() {
+			const latestURL = "https://github.com/ovh/ovhcloud-cli/releases/latest"
+			req, err := http.NewRequest("GET", latestURL, nil)
+			if err != nil {
+				return
+			}
+			req.Header.Set("Accept", "application/json")
+			resp, err := http.DefaultClient.Do(req)
+			if err != nil {
+				return
+			}
+			defer resp.Body.Close()
+			var data struct {
+				TagName string `json:"tag_name"`
+			}
+			if err := json.NewDecoder(resp.Body).Decode(&data); err != nil {
+				return
+			}
+			if data.TagName != "" && data.TagName != version.Version {
+				log.Printf("A new version of ovhcloud-cli is available: %s (current: %s)\n", data.TagName, version.Version)
+			}
+		}()
+
+		if httplib.Client == nil {
 			display.OutputError(&flags.OutputFormatConfig, "API client is not initialized, please run `ovhcloud login` to authenticate")
 			os.Exit(1) // Force os.Exit even in WASM mode
 		}
 	}
 }
 
 func init() {
-	http.InitClient()
+	httplib.InitClient()
 
 	// Load configuration files by order of increasing priority. All configuration
 	// files are optional. Only load file from user home if home could be resolve