ci(github): Added build step & pull_request trigger

Build step ensures that no errors in code will be missed. Without building there could, for example, be a missing property on a type, which would fail during build yet pass during CI, because the js runs properly.

pull_request trigger should ensure all tests are run and pass during a PR

Author: nonara

.github/workflows/main.yml

@@ -1,6 +1,6 @@
 name: Node.js CI
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build:
@@ -34,6 +34,9 @@ jobs:
       - name: Install Packages
         run: yarn install --frozen-lockfile
 
+      - name: Build
+        run: yarn build
+
       - name: Test
         run: yarn test
         env: