Fix yaml syntax and add debug step to validate ssh host in github actions

Author: edwinmh

.github/workflows/deploy-preview.yml

@@ -9,7 +9,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Debug SSH Host
-        run: echo "SSH Host: ${{ secrets.SSH_HOST_DEV_SERVER }}"
+        env:
+          SSH_HOST: ${{ secrets.SSH_HOST_DEV_SERVER }}
+        run: echo "SSH Host: $SSH_HOST"
 
       - name: Execute remote SSH commands using SSH key
         uses: appleboy/ssh-action@master