diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2d50d47..59478fd 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -23,8 +23,29 @@ defaults:
     shell: bash
 
 jobs:
+  os:
+    runs-on: ubuntu-latest
+    outputs:
+      os: ${{ steps.os.outputs.os }}
+    steps:
+      - name: 🤘 checkout
+        uses: actions/checkout@v2
+        
+      - name: 🔎 os
+        id: os
+        shell: pwsh
+        run: |
+          $path = './.github/workflows/os-matrix.json'
+          $os = if (test-path $path) { cat $path } else { '["ubuntu-latest"]' }
+          echo "::set-output name=os::$os"
+
   build:
-    runs-on: windows-latest
+    needs: os
+    name: build-${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: ${{ fromJSON(needs.os.outputs.os) }}
     steps:
       - name: 🤘 checkout
         uses: actions/checkout@v2
diff --git a/.github/workflows/os-matrix.json b/.github/workflows/os-matrix.json
new file mode 100644
index 0000000..aa561ef
--- /dev/null
+++ b/.github/workflows/os-matrix.json
@@ -0,0 +1 @@
+["windows-latest"]
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index 5d87ff8..5eee1f3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,5 +12,6 @@ pack
 *.cache
 .vs
 .*
+!.github
 log.txt
 *.binlog