Use static bin in snap

[kian99]

Description

This PR modifies the snapcraft.yaml file used to build the snap package to set CGO_ENABLED=0 during the build.

While normally a dynamic executable is not an issue for snaps since they are already running in an isolated environment, there is one use case this would improve. The stage-snaps directive is a snapcraft.yaml keyword one can use when building a snap to dump the contents of another snap. I ran into an issue where a snap I am building is based on core20 and using yq, after yq's update to core22, I ran into errors when my snap would try and run yq saying that glibc versions can't be found.

The documentation for stage-snaps can be found here.
The issue with staging snaps built on a different base is explained further here.

Testing

Run the following:

• snapcraft clean
• snapcraft
• mkdir -p /mnt/snap
• sudo mount -t squashfs -o ro ./yq_v4.44.2_amd64.snap /mnt/snap
• ldd /mnt/snap/bin/yq

Output:
not a dynamic executable