Linux x86_64 reproducible builds

[sneurlax]

Android might be feasible and I am checking the other platforms but we should only expect success for Linux and Android

I am updating build_app.sh to add a guix option and I am also updating the stack_releases scripts to make it easier to use this

[sneurlax]

Closes #6

IF the supported platforms are enough AND we can't figure out the rest of the platforms. Maybe guix will work in WSL2 for Windows builds and maybe if not guix then nix or something like that can work for macOS and/or iOS (I have doubts about the feasibility for iOS...)

[sneurlax]

cs_monero linux guix proof of concept pushed to https://github.com/cypherstack/cs_monero/compare/feat/guix ... but guix won't be suitable for macos and ios and there, nix will have to be used

nix is compatible w linux

first I am just seeing if nix can prove reproducibility for cs_monero

if that works then stack wallet may see a feat/nix instead of a feat/guix and this will just be an example

[sneurlax]

got nix working on linux and the rest of the platforms san win but just for flutter, not for stack wallet. TODO

[sneurlax]

see progress on https://github.com/cypherstack/stack_wallet/tree/feat/stagex-reproducible-builds ... need to 'just' incorporate monero's new stagex tooling for monero_c->cs_monero, too

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 4.79%. Comparing base (da38ddc) to head (f5eccc5).
⚠️ Report is 1 commits behind head on staging.

Additional details and impacted files

@@           Coverage Diff            @@
##           staging    #1274   +/-   ##
========================================
  Coverage     4.79%    4.79%           
========================================
  Files         1109     1109           
  Lines       111003   111003           
========================================
  Hits          5325     5325           
  Misses      105678   105678           

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