fix: properly clean up tmp dir after shared build

Building the A/B binaries happens in a tmpdir, which we try to delete at
the end. But we create files in the tmpdir from a privileged docker
container, so to delete this tmpdir we also need elevated privileges

Signed-off-by: Patrick Roy <[email protected]>

tools/devtool

@@ -525,7 +525,7 @@ cmd_build() {
       git branch -D $branch_name
       mkdir -p build/"$revision"
       cp $tmp_dir/build/cargo_target/$(uname -m)-unknown-linux-$libc/$profile/* build/"$revision"
-      rm -rf $tmp_dir
+      cmd_sh "rm -rf $tmp_dir"
     fi
 
     return $ret