Only build a single wheel per OS on PRs

Author: fcooper8472

.github/workflows/python-wheels.yml

@@ -11,6 +11,10 @@ on:
     types:
       - published
 
+env:
+  PY_VERS_FOR_PRS: "cp312-*"
+  PY_VERS_FULL: "cp39-* cp310-* cp311-* cp312-* cp313-* cp314-*"
+
 jobs:
   build_wheels_cloud:
     name: Build wheels on ${{ matrix.os }}
@@ -21,31 +25,27 @@ jobs:
         include:
           - os: ubuntu-24.04
             arch: x86_64
-            py-vers: cp39-* cp310-* cp311-* cp312-* cp313-* cp314-*
             before-all: yum groupinstall -y "Development Tools" && dnf -y install ninja-build pkgconf openssl-devel zlib-devel bzip2-devel xz-devel
             extra-env: ""
             mdt: ""
           - os: ubuntu-24.04-arm
             arch: aarch64
-            py-vers: cp39-* cp310-* cp311-* cp312-* cp313-* cp314-*
             before-all: yum groupinstall -y "Development Tools" && dnf -y install ninja-build pkgconf openssl-devel zlib-devel bzip2-devel xz-devel
             extra-env: ""
             mdt: ""
           - os: macos-15-intel
             arch: x86_64
-            py-vers: cp39-* cp310-* cp311-* cp312-* cp313-* cp314-*
             before-all: brew install pkg-config automake autoconf autoconf-archive libtool ninja openssl zlib bzip2 xz
             extra-env: CC=clang CXX=clang++
             mdt: 11
           - os: macos-15
             arch: arm64
-            py-vers: cp39-* cp310-* cp311-* cp312-* cp313-* cp314-*
             before-all: brew install pkg-config automake autoconf autoconf-archive libtool ninja openssl zlib bzip2 xz
             extra-env: CC=clang CXX=clang++
             mdt: 11
 
     env:
-      CIBW_BUILD: ${{ matrix.py-vers }}
+      CIBW_BUILD: ${{ github.event_name == 'pull_request' && env.PY_VERS_FOR_PRS || env.PY_VERS_FULL }}
       CIBW_SKIP: cp3*-musllinux_*
       CIBW_ARCHS: ${{ matrix.arch }}
       CIBW_MANYLINUX_X86_64_IMAGE: manylinux_2_28