add matrix.python.implementation

Author: altendky

.github/workflows/ci.yml

@@ -53,34 +53,42 @@ jobs:
             tox: py27
             action: 2.7
             docker: 2.7
+            implementation: cpython
+          - name: PyPy 2.7
+            tox: pypy27
+            action: pypy-2.7
+            docker: pypy2.7
+            implementation: pypy
           - name: CPython 3.6
             tox: py36
             action: 3.6
             docker: 3.6
+            implementation: cpython
           - name: CPython 3.7
             tox: py37
             action: 3.7
             docker: 3.7
+            implementation: cpython
           - name: CPython 3.8
             tox: py38
             action: 3.8
             docker: 3.8
+            implementation: cpython
           - name: CPython 3.9
             tox: py39
             action: 3.9
             docker: 3.9
-          - name: PyPy 2.7
-            tox: pypy27
-            action: pypy-2.7
-            docker: pypy2.7
+            implementation: cpython
           - name: PyPy 3.6
             tox: pypy36
             action: pypy-3.6
             docker: pypy3.6
+            implementation: pypy
           - name: PyPy 3.7
             tox: pypy37
             action: pypy-3.7
             docker: pypy3.7
+            implementation: pypy
         arch:
           - name: x86
             action: x86