ci: add webpack workflow

.github/workflows/docs.yml

@@ -4,7 +4,6 @@ on:
   push:
     branches:
     - '*'
-    - '!gh-action'
     - '!webpack'
     - '!docs'
 

.github/workflows/webpack.yml

@@ -0,0 +1,25 @@
+name: Webpack
+
+on:
+  push:
+    branches:
+    - '*'
+    - '!webpack'
+    - '!docs'
+
+jobs:
+  deploy:
+    name: deploy
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: install node v12
+      uses: actions/setup-node@master
+      with:
+        node-version: 12
+    - name: npm install
+      run: npm install
+    - name: deploy webpack
+      uses: discordjs/action-webpack@v1
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}