Add deploy workflow

.github/workflows/deploy.yml

@@ -0,0 +1,32 @@
+name: Deploy GridTV
+
+on:
+  push:
+    branches:
+      - main
+      - beta
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Start SSH agent
+        uses: webfactory/ssh-agent@v0.9.0
+        with:
+          ssh-private-key: ${{ secrets.SSH_KEY }}
+
+      - name: Add server to known_hosts
+        run: |
+          mkdir -p ~/.ssh
+          ssh-keyscan -H ${{ secrets.SSH_HOST }} >> ~/.ssh/known_hosts
+
+      - name: Deploy main
+        if: github.ref == 'refs/heads/main'
+        run: |
+          ssh ${{ secrets.SSH_USER }}@${{ secrets.SSH_HOST }} main
+
+      - name: Deploy beta
+        if: github.ref == 'refs/heads/beta'
+        run: |
+          ssh ${{ secrets.SSH_USER }}@${{ secrets.SSH_HOST }} beta