Create build.yml

Author: katosdev

.github/workflows/build.yml

@@ -0,0 +1,16 @@
+name: Build JavaScript assets
+
+on:
+    push:
+        branches:
+            - master
+
+jobs:
+    build:
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@master
+            - uses: flarum/action-build@master
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}