Enforce x86_64 for build environment

This ensures that x86_64 is leveraged for our pure x86_64 builds even on arm64 runners.

.github/workflows/actions.yml

@@ -66,10 +66,13 @@ jobs:
           python-version: 3.11.4
       - name: Build
         run: >
+          # We initially use `arch -x86_64` to ensure that we use an x86_64 version
+          # of Python, regardless of the host architecture.
+          # Subsequent invocations will all use the x86_64 `python3` binary within the venv.
           cd scripts &&
-          ./build.sh &&
+          arch -x86_64 /bin/bash ./build.sh &&
           cd ../client/dist &&
-          bash ../../scripts/tests/macos_test.sh &&
+          arch -x86_64 /bin/bash ../../scripts/tests/macos_test.sh &&
           rm output.log &&
           ln -s /Applications "Applications (admin)" &&
           hdiutil create -fs HFS+ -srcfolder . -volname NSO-RPC mac-installer.dmg &&

scripts/build.sh

@@ -1,7 +1,15 @@
 #!/bin/bash
+set -e
+
+# Run everything relative to our script directory.
+cd "$(dirname "$0")"
+
+# Activate a virtual environment so we don't pollute the system environment.
 python3 -m venv --upgrade-deps venv
 source venv/bin/activate
 cd ../client
+
+# As this is an x86_64 only version, ensure `py2app` outputs x86_64.
 python3 -m pip install -r requirements.txt pyqt6 py2app GitPython
 python3 _version.py
 rm setup.py