Update build.yml

Author: mayeut

.github/workflows/build.yml

@@ -35,7 +35,8 @@ jobs:
     steps:
       - id: matrix
         run: |
-          JSON=$(cat << EOF | jq -c '[foreach .[] as $platform (0; foreach $platform.policies.[] as $policy (0; {policy: $policy, platform: $platform.platform, runner: $platform.runner}))]'
+          QUERY='[foreach .[] as $platform (0; foreach $platform.policies.[] as $policy (0; {policy: $policy, platform: $platform.platform, runner: $platform.runner}))]'
+          JSON=$(cat << EOF | jq -c "${QUERY}"
           [
             {"platform": "x86_64", "runner": "ubuntu-22.04", "policies": ["manylinux2014", "manylinux_2_28", "manylinux_2_34", "musllinux_1_2"]},
             {"platform": "aarch64", "runner": "ubuntu-22.04", "policies": ["manylinux2014", "manylinux_2_28", "manylinux_2_34", "musllinux_1_2"]},