snap: Fix build process for Tier 2 platforms

[RAOF]

Unfortunately this only actually fixes the build for arm64; it seems that we hit various bugs in Rust on ppc64 and armhf.

[codecov[bot]]

Codecov Report

Merging #732 into main will decrease coverage by 0.17%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #732      +/-   ##
==========================================
- Coverage   39.16%   38.99%   -0.18%     
==========================================
  Files          73       73              
  Lines        9653     9701      +48     
  Branches     2183     2229      +46     
==========================================
+ Hits         3781     3783       +2     
+ Misses       4819     4756      -63     
- Partials     1053     1162     +109     

[elegaanz]

it seems that we hit various bugs in Rust on ppc64 and armhf.

should we wait for these bugs to be fixed, or can we merge now?