build python 3.7 wheels for aarch64

Author: grlee77

.github/workflows/wheel_tests_and_release.yml

@@ -59,7 +59,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-18.04]
-        cibw_python: [ "cp38-*" , "cp39-*", "cp310-*"]
+        cibw_python: [ "cp37-*" , "cp38-*" , "cp39-*", "cp310-*"]
         cibw_manylinux: [ manylinux2014 ]
     steps:
       - uses: actions/checkout@v2

pyproject.toml

@@ -17,6 +17,7 @@ requires = [
 
     # numpy 1.19 was the first minor release to provide aarch64 wheels, but
     # wheels require fixes contained in numpy 1.19.2
+    "numpy==1.19.2; python_version=='3.7' and platform_machine=='aarch64'",
     "numpy==1.19.2; python_version=='3.8' and platform_machine=='aarch64'",
     # aarch64 for py39 is covered by default requirement below