replace deprecated io/ioutil

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

registry/storage/driver/middleware/cloudfront/middleware.go

@@ -7,8 +7,8 @@ import (
 	"crypto/x509"
 	"encoding/pem"
 	"fmt"
-	"io/ioutil"
 	"net/url"
+	"os"
 	"strings"
 	"time"
 
@@ -89,7 +89,7 @@ func newCloudFrontStorageMiddleware(storageDriver storagedriver.StorageDriver, o
 	}
 
 	// get urlSigner from the file specified in pkPath
-	pkBytes, err := ioutil.ReadFile(pkPath)
+	pkBytes, err := os.ReadFile(pkPath)
 	if err != nil {
 		return nil, fmt.Errorf("failed to read privatekey file: %s", err)
 	}

registry/storage/driver/middleware/cloudfront/middleware_test.go

@@ -1,7 +1,6 @@
 package middleware
 
 import (
-	"io/ioutil"
 	"os"
 	"testing"
 
@@ -41,7 +40,7 @@ pZeMRablbPQdp8/1NyIwimq1VlG0ohQ4P6qhW7E09ZMC
 -----END RSA PRIVATE KEY-----
 `
 
-	file, err := ioutil.TempFile("", "pkey")
+	file, err := os.CreateTemp("", "pkey")
 	if err != nil {
 		t.Fatal("File cannot be created")
 	}

registry/storage/driver/middleware/cloudfront/s3filter.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"net"
 	"net/http"
 	"strings"
@@ -68,7 +68,7 @@ func fetchAWSIPs(url string) (awsIPResponse, error) {
 		return response, err
 	}
 	if resp.StatusCode != 200 {
-		body, _ := ioutil.ReadAll(resp.Body)
+		body, _ := io.ReadAll(resp.Body)
 		return response, fmt.Errorf("failed to fetch network data. response = %s", body)
 	}
 	decoder := json.NewDecoder(resp.Body)