Exclude musllinux wheels (#354)

Author: eleftherioszisis

.github/workflows/publish-sdist-wheels.yml

@@ -4,7 +4,7 @@ on: [pull_request, push]
 env:
   CIBW_BUILD_VERBOSITY: 3
   CIBW_BUILD: 'cp3?-*'
-  CIBW_SKIP: 'cp35-* cp36-* *-manylinux_i686 *-win32'
+  CIBW_SKIP: 'cp35-* cp36-* *-manylinux_i686 *-musllinux_* *-win32'
   CIBW_BEFORE_TEST: pip install -r {project}/tests/requirement_tests.txt
   CIBW_TEST_COMMAND: pytest -s -v {project}/tests