fix ci and setup cross-compilation

.github/actions/setup-rust/action.yml

@@ -32,6 +32,13 @@ runs:
       sudo apt-get install libssl-dev:i386 gcc-multilib clang -y
       echo "CC=clang" >> $GITHUB_ENV
       echo "PKG_CONFIG_SYSROOT_DIR=/" >> $GITHUB_ENV
+      
+  - name: Install s390x cross-compilation toolchain
+    if: ${{ matrix.target == 's390x-unknown-linux-gnu' }}
+    shell: bash
+    run: |
+      sudo apt-get update
+      sudo apt-get install -y gcc-s390x-linux-gnu
 
   - uses: actions/cache@668228422ae6a00e4ad889ee87cd7109ec5666a7 # v5.0.4
     with: