ci: ✨ run tests on a nightly basis (#1303)

* ci: ✨ run tests on a nightly basis

* ci: add conditional for canary test job

Author: ericapisani

.github/workflows/test.yml

@@ -1,9 +1,11 @@
 name: Plugin Tests
 
 on:
+  pull_request:
   push:
     branches: [main]
-  pull_request:
+  schedule:
+    - cron: '0 0 * * *'
 
 jobs:
   build:
@@ -50,6 +52,7 @@ jobs:
             node-version: 12
       fail-fast: false
 
+    if: github.ref_name == 'main'
     steps:
       - uses: actions/checkout@v2
       - name: Use Node.js ${{ matrix.node-version }}