Hasura proxy updated

Dockerfile

@@ -27,8 +27,8 @@ RUN rm -rf ./*
 # Copy the compiled static assets FROM THE BUILDER STAGE
 COPY --from=builder /app/dist/ .
 
-# Copy your custom Nginx configuration
-COPY nginx.conf /etc/nginx/nginx.conf
+# Copy the Nginx configuration as a template so env variables (like HASURA_ADMIN_SECRET) are substituted at runtime
+COPY nginx.conf /etc/nginx/templates/default.conf.template
 
 EXPOSE 80