CI: Fix nightly build

Author: adamgreig

.github/workflows/ci.yaml

@@ -77,8 +77,8 @@ jobs:
 
       - name: Put new bin directory into path
         run: |
-          echo "/home/runner/cache-bin" >> $GITHUB_PATH
-          echo "/home/runner/cache-bin/arm_gcc/bin" >> $GITHUB_PATH
+          echo "$HOME/cache-bin" >> $GITHUB_PATH
+          echo "$HOME/cache-bin/arm_gcc/bin" >> $GITHUB_PATH
 
       - name: Test
         run: bash ci/script.sh

ci/main/app4/src/main.rs

@@ -15,7 +15,7 @@ fn main() -> ! {
         // check that DATA is properly initialized
         if ptr::read_volatile(&DATA) != 1 {
             // this makes QEMU crash
-            asm!("BKPT" :::: "volatile");
+            asm!("BKPT");
         }
     }