Modify sandbox to set CC and CXX as environment variables for Zig cross-compilation and unset them afterward.

Author: jiridanek

scripts/sandbox.py

@@ -50,8 +50,10 @@ def main() -> int:
         target = "s390x-linux-gnu"
         additional_arguments = [
             f"--volume={os.getcwd()}/bin/zig-0.15.1:/mnt",
-            f"--build-arg=CC=/mnt/zig-0.15.1/zig cc -target {target}",
-            f"--build-arg=CXX=/mnt/zig-0.15.1/zig c++ -target {target}",
+            f"--env=CC=/mnt/zig-0.15.1/zig cc -target {target}",
+            f"--env=CXX=/mnt/zig-0.15.1/zig c++ -target {target}",
+            f"--unsetenv=CC",
+            f"--unsetenv=CXX",
             tmpdir,
         ]
         command = []