How do i add a executable to a snap

[ogra]

that wont work, you would need classic confinement for using ccextractor from the host but “just calling an external binary” is not a criteria to get classic confinement granted:

Process for reviewing classic confinement snaps

Classic confinement review process Background As of snapd 2.20, snappy supports confinement: classic which allows the snap to run without restrictions. Future releases of snapd will also support a classic interface (name TBD) that operates similarly. Snaps specifying classic confinement may target the stable channel, but are only supported on classic distro systems (ie, not on Ubuntu Core). Because classic confinement snaps run without restrictions, use of classic confinement effectively gran…

you will need to ship it inside your snap one way or the other …