Fix CI: create empty .env file for docker-compose build

docker-compose.yaml references env_file: .env which is created by
Ansible on the server but doesn't exist in the repo. Create an empty
file during CI build to satisfy the reference.

Signed-off-by: Marc Campbell <marc.e.campbell@gmail.com>

.github/workflows/deploy.yml

@@ -37,6 +37,8 @@ jobs:
 
       - name: Build and push images
         run: |
+          # Create empty .env file (docker-compose references it, but it's only needed at runtime)
+          touch .env
           docker compose build
           docker compose push
         env: