bug: add proxy support for oci getter

adds missing proxy support on oci chart getter.

Signed-off-by: Ricardo Maraschini <ricardo.maraschini@gmail.com>
(cherry picked from commit 94c1deae6d)

pkg/getter/ocigetter.go

@@ -119,6 +119,7 @@ func (g *OCIGetter) newRegistryClient() (*registry.Client, error) {
 			IdleConnTimeout:       90 * time.Second,
 			TLSHandshakeTimeout:   10 * time.Second,
 			ExpectContinueTimeout: 1 * time.Second,
+			Proxy:                 http.ProxyFromEnvironment,
 		}
 	})