routes: handle "mount blob" to remain compliant

"mount blob" was the only feature we didn't handle.
We don't fully support it yet because we don't have access control
support, but at least handle it and return something sane to remain
compliant.

pkg/compliance/v1_0_0/check.go

@@ -377,6 +377,14 @@ func CheckWorkflows(t *testing.T, config *compliance.Config) {
 			So(resp.Header().Get("Content-Length"), ShouldEqual, "0")
 		})
 
+		Convey("Mount blobs", func() {
+			Print("\nMount blobs from another repository")
+			// create a upload
+			resp, err := resty.R().Post(baseURL + "/v2/repo/blobs/uploads/?digest=\"abc\"&&from=\"xyz\"")
+			So(err, ShouldBeNil)
+			So(resp.StatusCode(), ShouldEqual, 405)
+		})
+
 		Convey("Manifests", func() {
 			Print("\nManifests")
 			// create a blob/layer