rehaul action yml

.github/workflows/main.yml

@@ -1,3 +1,16 @@
-action "action a" {
-  uses = "./codecov-action/"
-}
+name: Codecov action workflow
+on: [push]
+jobs:
+  run:
+    name: Run
+    runs-on: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: [ubuntu-latest, windows-latest,macos-latest]
+    steps:
+    - uses: actions/checkout@master
+    
+    - name: Set Node.js 10.x
+      uses: actions/setup-node@master
+      with:
+        version: 10.x