chore: add coverage job

.github/workflows/main.yml

@@ -40,6 +40,38 @@ jobs:
     - name: Lint
       run: npm run lint
 
+  coverage:
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Checkout repo
+      uses: actions/checkout@v1
+
+    - name: Add SSH deploy key
+      uses: shimataro/ssh-key-action@v2
+      with:
+        key: ${{ secrets.UNRAID_BOT_SSH_KEY }}
+        known_hosts: ${{ secrets.KNOWN_HOSTS }}
+
+    - name: Install node v14
+      uses: actions/setup-node@v1
+      with:
+        node-version: 14
+
+    - name: Load npm cache
+      uses: actions/cache@v2
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-node-
+
+    - name: Installing node deps
+      run: npm install
+
+    - name: Check coverage
+      run: npm run cover:types
+
   build:
     runs-on: ubuntu-latest