Revert !190568

The following discussion from !190244 (closed) should be addressed:

• @ashvins started a discussion: (+7 comments)

  I had a discussion with @adebayo_a about this- since we tested that sysbox version 0.6.7 works without any modification from our side I am closing this MR. In case we receive a similar bug report, our recommendation will be to bump up the sysbox version.

  cc @cwoolley-gitlab @vtak

This change will be reverted to keep the permission bits the same everywhere we mount a secret and adhere ourselves with principle of least privilege.