static and media url fix 4

Dockerfile.nginx

@@ -0,0 +1,8 @@
+ARG NGINX_IMAGE=nginx:1.27-alpine
+FROM ${NGINX_IMAGE}
+
+# The official Nginx entrypoint renders templates into /etc/nginx/conf.d.
+# Baking the template into the image avoids stale or missing host bind mounts
+# in Git-based Coolify deployments while preserving env substitution for
+# MEDIA_SIGNING_SECRET.
+COPY docker/nginx.conf /etc/nginx/templates/default.conf.template