Add a GitHub Action to build and deploy the frontend.

.github/workflows/Build & Deploy.yml

@@ -0,0 +1,32 @@
+name: Build & Deploy
+on:
+  push:
+    branches:
+      - main
+jobs:
+  build-and-deploy:
+    name: app.flowey.paveloom.dev
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Build the frontend
+        run: |
+          cd frontend
+          npm run build
+      - name: Deploy
+        env:
+          SSH_KEY: ${{ secrets.SSH_KEY }}
+          SSH_KEY_PASS: ${{ secrets.SSH_KEY_PASS }}
+          SSH_USERNAME: ${{ secrets.SSH_USERNAME }}
+          SSH_HOST: ${{ secrets.SSH_HOST }}
+          SSH_REMOTE_DIR: ${{ secrets.SSH_REMOTE_DIR }}
+        run: |
+          mkdir -p ~/.ssh/ && ssh-keyscan $SSH_HOST >> ~/.ssh/known_hosts 2>/dev/null
+          eval $(ssh-agent -s)
+          echo '#!/bin/sh' > ~/.ssh_askpass
+          echo 'echo $SSH_KEY_PASS' > ~/.ssh_askpass && chmod 700 ~/.ssh_askpass
+          echo "$SSH_KEY" | tr -d '\r' | DISPLAY=None SSH_ASKPASS=~/.ssh_askpass ssh-add -
+          rsync -avzh --delete-after frontend/dist/ "$SSH_USERNAME@$SSH_HOST:$SSH_REMOTE_DIR"