Merge dashpay#6397: ci: add powerpc64 to GH Guix job matrix

c5d5b14 ci: add powerpc64 to GH Guix job matrix (UdjinM6)

Pull request description:

  ## Issue being fixed or feature implemented
  I guess we should make sure that binaries for every possible platform can be built via Guix with no issues even if we do not want to provide "official" binaries for it.

  ## What was done?

  ## How Has This Been Tested?

  ## Breaking Changes

  ## Checklist:
  - [ ] I have performed a self-review of my own code
  - [ ] I have commented my code, particularly in hard-to-understand areas
  - [ ] I have added or updated relevant unit/integration/functional/e2e tests
  - [ ] I have made corresponding changes to the documentation
  - [ ] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

Top commit has no ACKs.

Tree-SHA512: 6464b68a47e680bb379c82842599200d6917adb8f1493fa75ac80ddc7a6fea92a9190215cfa3f32b0bd88e2dd0425d4eb13846ea2d7e19e144afff9c1171ff13

.github/workflows/guix-build.yml

@@ -68,7 +68,7 @@ jobs:
 #    if: ${{ contains(github.event.pull_request.labels.*.name, 'guix-build') }}
     strategy:
       matrix:
-        build_target: [x86_64-linux-gnu, arm-linux-gnueabihf, aarch64-linux-gnu, riscv64-linux-gnu, x86_64-w64-mingw32, x86_64-apple-darwin, arm64-apple-darwin]
+        build_target: [x86_64-linux-gnu, arm-linux-gnueabihf, aarch64-linux-gnu, riscv64-linux-gnu, powerpc64-linux-gnu, x86_64-w64-mingw32, x86_64-apple-darwin, arm64-apple-darwin]
 
     timeout-minutes: 480
     steps: