ci: add musl-gcc

Signed-off-by: callum-ryan <[email protected]>

.github/workflows/rust.yml

@@ -61,7 +61,7 @@ jobs:
           # dependencies are only needed on ubuntu as that's the only place where
           # we make cross-compilation
           if [[ $OS =~ ^ubuntu.*$ ]]; then
-            sudo apt-get install -qq crossbuild-essential-arm64 crossbuild-essential-armhf libssl-dev
+            sudo apt-get install -qq crossbuild-essential-arm64 crossbuild-essential-armhf musl-gcc libssl-dev
           fi
 
           # some additional configuration for cross-compilation on linux