Fix step-ca root CA access on Linux CI

Host chmod cannot open 0700 dirs owned by UID 1000, so
`-f` never sees root_ca.crt. Chmod from inside the
container as root while waiting for the cert.

Signed-off-by: Bryan Frimin <bryan@probo.com>

pkg/server/api/connect/v1/magic_link_handler_test.go

@@ -105,5 +105,4 @@ func TestMagicLinkHandler_SendHandler_Validation(t *testing.T) {
 
 		assert.Equal(t, http.StatusBadRequest, rec.Code)
 	})
-
 }