Run test script in Bash on Windows

Author: jonathanpallant

.github/workflows/build.yml

@@ -314,6 +314,7 @@ jobs:
       - name: Install QEMU
         run: choco install qemu
       - name: Run tests in QEMU
+        shell: bash
         run: ./tests.sh
 
   # Gather all the above qemu jobs together for the purposes of getting an overall pass-fail