Add runners. windows-latest and macos-latest.

Signed-off-by: Masaki Muranaka <monaka@monami-ya.com>

Author: monaka

.github/workflows/maven.yml

@@ -12,11 +12,15 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
     strategy:
       matrix:
         jdk-version: [11]
         mongodb-version: [3.6]
+        runner-os:
+          - ubuntu-latest
+          - windows-latest
+          - macos-latest
+    runs-on: ${{ matrix.runner-os }}
 
     steps:
     - uses: actions/checkout@v2