Set PATH correctly

Author: jonathanpallant

.github/workflows/build.yml

@@ -316,7 +316,7 @@ jobs:
       - name: Install QEMU
         run: choco install qemu
       - name: Run tests in QEMU
-        run: PATH=$PATH:/c/Program\ Files/qemu ./tests.sh
+        run: PATH=${PATH}:/c/Program\ Files/qemu ./tests.sh
 
   # Gather all the above qemu jobs together for the purposes of getting an overall pass-fail
   qemu-test-all: