Attempting to fix IBM target via: rust-lang/stacker#79 (comment)

Author: alxmrs

.github/workflows/ci-maturin.yaml

@@ -35,6 +35,8 @@ jobs:
             target: s390x
           - runner: ubuntu-24.04
             target: ppc64le
+    env:
+      CFLAGS_s390x_unknown_linux_gnu: -march=z10
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5