Update GH Actions workflow to run tests on push (#36)

Author: yugokato

.github/workflows/test.yml

@@ -50,7 +50,7 @@ jobs:
 
   package:
     needs: [changes, lint]
-    if: ${{ needs.changes.outputs.has-changes == 'true' }}
+    if: ${{ github.event_name == 'push' || needs.changes.outputs.has-changes == 'true' }}
     runs-on: ubuntu-latest
     steps:
       - name: Check out
@@ -62,7 +62,7 @@ jobs:
 
   test:
     needs: [package]
-    if: ${{ needs.changes.outputs.has-changes == 'true' }}
+    if: ${{ github.event_name == 'push' || needs.changes.outputs.has-changes == 'true' }}
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false