Try to merge windows 2016 and 2019

.github/workflows/windows-2019.yml

@@ -1,35 +0,0 @@
-name: windows-2019
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-    branches:
-      - '*'
-jobs:
-  latest:
-    runs-on: windows-2019
-    steps:
-      - name: Install libraries with vcpkg
-        run: |
-          vcpkg --triplet x64-windows install %dependencies% || (
-            sleep 4 && vcpkg --triplet x64-windows install %dependencies%
-          ) || (
-            sleep 25 && vcpkg --triplet x64-windows install %dependencies%
-          )
-        env:
-          dependencies: openssl readline zlib
-      - name: Install libraries with chocolatey
-        run: choco install winflexbison3
-      - name: Checkout # not using actions/checkout because it's unstable.
-        run: git clone --depth=50 https://github.com/ruby/ruby .
-      - name: configure
-        run: |
-          call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
-          win32/configure.bat --without-ext=+,dbm,gdbm --enable-bundled-libffi --with-opt-dir=C:/vcpkg/installed/x64-windows
-      - name: nmake
-        run: |
-          call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
-          set YACC=win_bison
-          nmake up
-          nmake

.github/workflows/windows.yml

@@ -1,4 +1,4 @@
-name: windows-2016
+name: windows
 on:
   push:
     branches:
@@ -8,7 +8,16 @@ on:
       - '*'
 jobs:
   latest:
-    runs-on: windows-2016
+    strategy:
+      matrix:
+        os: [windows-2016, windows-2019]
+        vs: [2017, 2019]
+        exclude:
+          - os: windows-2016
+            vs: 2019
+          - os: windows-2019
+            vs: 2017
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Install libraries with vcpkg
         run: |
@@ -25,11 +34,11 @@ jobs:
         run: git clone --depth=50 https://github.com/ruby/ruby .
       - name: configure
         run: |
-          call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
+          call "C:\Program Files (x86)\Microsoft Visual Studio\${{ matrix.vs }}\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
           win32/configure.bat --without-ext=+,dbm,gdbm --enable-bundled-libffi --with-opt-dir=C:/vcpkg/installed/x64-windows
       - name: nmake
         run: |
-          call "C:\Program Files (x86)\Microsoft Visual Studio\2017\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
+          call "C:\Program Files (x86)\Microsoft Visual Studio\${{ matrix.vs }}\Enterprise\VC\Auxiliary\Build\vcvars64.bat"
           set YACC=win_bison
           nmake up
           nmake