compose: forward ADMIN_BOOTSTRAP_EMAIL and SITE_BASE_URL to the container

Portainer stack variables are substitution values for the compose file,
not container environment. A var added to the stack and not listed here
is silently absent at runtime.

docker-compose.yml

@@ -42,6 +42,10 @@ services:
       - NTFY_TOKEN=${NTFY_TOKEN}
       - ADMIN_TOKEN=${ADMIN_TOKEN}
       - EVENTS_FEED_URL=${EVENTS_FEED_URL}
+      # P0 identity. Portainer stack env only reaches the container if it is
+      # forwarded here; adding it to the stack alone is not enough.
+      - ADMIN_BOOTSTRAP_EMAIL=${ADMIN_BOOTSTRAP_EMAIL}
+      - SITE_BASE_URL=${SITE_BASE_URL}
     volumes:
       - /srv/scout-website/data:/data
       - /srv/scout-website/secrets/service_account.json:/app/service_account.json:ro