fix(ci): set up .env before building static site

Author: themightychris

.github/workflows/deploy.yml

@@ -25,6 +25,9 @@ jobs:
       - name: Install dependencies
         run: npm ci
 
+      - name: Create .env file
+        run: echo ${{ secrets.FRONTEND_ENV_BASE64 }} | base64 -d > .env
+
       - name: Generate static files
         run: npm run generate