Get nightly in build action

.github/workflows/main.yml

@@ -6,11 +6,11 @@ name: Build Site
 on:
   # Triggers the workflow on push or pull request events but only for the main branch
   push:
-    branches: [ main ]
+    branches: [main]
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
-  
+
 env:
   CARGO_TERM_COLOR: always
 
@@ -26,11 +26,17 @@ jobs:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
       - uses: actions/checkout@v2
 
+      - name: Install nightly
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          override: true
+
       # Runs a single command using the runners shell
       - name: Build site
         run: |
           cargo run --no-default-features --verbose
-          
+
       - name: Deploy
         uses: peaceiris/actions-gh-pages@v3
         with: