ENH: Introduce manylinux option with ARM

Exposes input parameter to allow the user to build for multiple Linux
toolsets and target architectures via available manylinux docker images.

Depends on ARM support introduced in ITKPythonPackage:
InsightSoftwareConsortium/ITKPythonPackage#236

.github/workflows/build-test-package-python.yml

@@ -19,7 +19,7 @@ on:
         description: 'Git tag or commit hash for ITKPythonPackage build scripts to use'
         required: false
         type: string
-        default: 'aa3b0767801ecc489f6219777ead2652f7ac4ccf'
+        default: 'd25b413ac952309d3d89e0a50b31e98549db8b92'
       itk-python-package-org:
         description: 'Github organization name for fetching ITKPythonPackage build scripts'
         required: false
@@ -30,6 +30,11 @@ on:
         # example: InsightSoftwareConsortium/ITKMeshToPolyData@3ad8f08:InsightSoftwareConsortium/ITKBSplineGradient@0.3.0
         required: false
         type: string
+      manylinux-platforms:
+        description: 'colon-delimited list of "<manylinux-image>-<arch>" specializations'
+        required: false
+        type: string
+        default: "_2_28-aarch64:_2_28-x64:2014-x64"
     secrets:
       pypi_password:
         required: false  # Packages will not be uploaded to PyPI if not set
@@ -80,9 +85,11 @@ jobs:
           CMAKE_OPTIONS="--cmake_options ${{ inputs.cmake-options }}"
         fi
 
-        for manylinux_version in "_2_28" "2014"; do
+        MANYLINUX_PLATFORMS=${{ inputs.manylinux-platforms }}
+        for manylinux_version in ${MANYLINUX_PLATFORMS//:/ }; do
           rm -rf ITKPythonPackage
-          export MANYLINUX_VERSION=${manylinux_version}
+          export MANYLINUX_VERSION=`(echo ${manylinux_version} | cut -d '-' -f 1)`
+          export TARGET_ARCH=`(echo ${manylinux_version} | cut -d '-' -f 2)`
           echo "Building for manylinux specialization ${MANYLINUX_VERSION}"
           ./dockcross-manylinux-download-cache-and-build-module-wheels.sh cp${{ matrix.python-version }} $CMAKE_OPTIONS
         done