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fix(offload-build): Handle non-bash shell on build server

Carl Smedstad requested to merge carsme/devtools:offload-build-handle-non-bash into master

Yesterday I had DevOps change my default shell on build.archlinux.org from bash to fish. This broke offload builds with pkgctl in the following way:

$ pkgctl build --testing --offload
==> Updating pacman database cache
:: Synchronizing package databases...
 core downloading...
 extra downloading...
 multilib downloading...
==> Building opentofu
  ->   repo: extra-testing
  ->   arch: x86_64
  -> worker: carsme-7
==> Building opentofu for [extra-testing] (x86_64)
==> Creating source package...
  -> Adding PKGBUILD...
  -> Generating .SRCINFO file...
  -> Adding tofu.fish...
  -> Compressing source package...
==> Leaving fakeroot environment.
fish: Unsupported use of '='. In fish, please use 'set temp "${XDG_CACHE_HOME:-$HOME/.cache}/offload-build"'.
        temp="${XDG_CACHE_HOME:-$HOME/.cache}/offload-build" &&
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^

Solve this by explicitly using bash for the commands sent via SSH by offload-build.

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