[Temp] Create a temporary s390x environment

.github/workflows/s390x.yml

@@ -0,0 +1,28 @@
+on:
+  pull_request:
+
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        # Using my fork because there seems to be a bug where it couldn't find `s390x/fedora:latest`
+      - uses: LecrisUT/run-on-arch-action@fix/arch-flag
+        with:
+          distro: none
+          arch: s390x
+          base_image: "s390x/fedora:latest"
+          run: |
+            echo "::group::Debug stuff"
+            # Double-check we are in the appropriate environment
+            uname -a
+            echo "::endgroup::"
+            
+            echo "::group::Install rust environment"
+            dnf install -y cargo
+            echo "::endgroup::"
+            
+            echo "::group::Run cargo test"
+            # TODO: Help me with this section
+            cargo test --workspace --verbose
+            echo "::endgroup::"