S390X CI Support (#1304)

.github/workflows/main.yml

@@ -42,6 +42,10 @@ jobs:
           - os: ubuntu-latest
             env:
               TARGET_TRIPLE: aarch64-unknown-linux-gnu
+          # s390x requires QEMU 6.1 or greater, we could build it from source, but ubuntu 22.04 comes with 6.2 by default
+          - os: ubuntu-latest
+            env:
+              TARGET_TRIPLE: s390x-unknown-linux-gnu
 
     steps:
     - uses: actions/checkout@v3
@@ -79,6 +83,12 @@ jobs:
         sudo apt-get update
         sudo apt-get install -y gcc-aarch64-linux-gnu qemu-user
 
+    - name: Install s390x toolchain and qemu
+      if: matrix.env.TARGET_TRIPLE == 's390x-unknown-linux-gnu'
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y gcc-s390x-linux-gnu qemu-user
+
     - name: Prepare dependencies
       run: |
         git config --global user.email "user@example.com"