breaking out arm build job

.github/workflows/try_build.yml

@@ -59,11 +59,24 @@ jobs:
           echo "/usr/lib/ccache:/usr/local/opt/ccache/libexec" >> $GITHUB_PATH
           HOST_CCACHE_DIR="$(ccache -k cache_dir)"
           mkdir -p $HOST_CCACHE_DIR
-      - name: Build wheels  # check https://cibuildwheel.readthedocs.io/en/stable/setup/#github-actions
+      - name: Build wheels (ARM)
+        if: matrix.os == 'ubuntu-24.04-arm'
+        uses: pypa/cibuildwheel@v2.23.3
+        env:
+          # override the default CentOS “yum install … ccache” and drop ccache
+          CIBW_BEFORE_ALL_LINUX: |
+            yum install -y \
+              zlib-devel \
+              curl-devel \
+              expat-devel \
+              libpng-devel
+          CIBW_BUILD: ${{ matrix.cibuild }}
+          CIBW_ARCHS_LINUX: ${{ matrix.cibw_arch }}
+          # … any other cibuildwheel env you already have …
+
+      - name: Build wheels (all other platforms)
+        if: matrix.os != 'ubuntu-24.04-arm'
         uses: pypa/cibuildwheel@v2.23.3
-        # to supply options, put them in 'env', like:
-        # env:
-        #   CIBW_SOME_OPTION: value
         env:
           CIBW_BUILD: ${{ matrix.cibuild }}
           CIBW_ARCHS_MACOS: ${{ matrix.macos-arch }}