fix: add blazor-environment header to nginx for staging config

BackOffice WASM app defaulted to Production environment because
nginx didn't set the blazor-environment response header. This caused
the app to load appsettings.Production.json (GwUrl=https://cms.kbs1.ir)
instead of appsettings.Staging.json (GwUrl=https://cms.se.kbs1.ir),
resulting in 401 gRPC errors on the login page.

- Add docker-entrypoint.sh that generates nginx config with blazor-environment header
- Default BLAZOR_ENVIRONMENT=Staging (configurable via K8s env var)
- This ensures the WASM app loads the correct staging configuration

src/BackOffice/Dockerfile

@@ -25,14 +25,12 @@ RUN rm -rf /usr/share/nginx/html/*
 # Copy published wwwroot (Blazor WASM output)
 COPY --from=build /app/publish/wwwroot .
 
-# Configure nginx for SPA routing
-RUN echo 'server { \
-    listen 80; \
-    server_name _; \
-    location / { \
-        root /usr/share/nginx/html; \
-        try_files $uri $uri/ /index.html; \
-    } \
-}' > /etc/nginx/conf.d/default.conf
+# Copy entrypoint script that sets blazor-environment header
+COPY ["BackOffice/docker-entrypoint.sh", "/docker-entrypoint.sh"]
+RUN chmod +x /docker-entrypoint.sh
+
+# Default Blazor environment (override via K8s env var BLAZOR_ENVIRONMENT)
+ENV BLAZOR_ENVIRONMENT=Staging
 
 EXPOSE 80
+CMD ["/docker-entrypoint.sh"]

src/BackOffice/docker-entrypoint.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+# Generate nginx config with blazor-environment header
+# BLAZOR_ENVIRONMENT defaults to "Staging" if not set
+BLAZOR_ENV="${BLAZOR_ENVIRONMENT:-Staging}"
+
+cat > /etc/nginx/conf.d/default.conf <<NGINX_CONF
+server {
+    listen 80;
+    server_name _;
+    location / {
+        root /usr/share/nginx/html;
+        try_files \$uri \$uri/ /index.html;
+        add_header blazor-environment $BLAZOR_ENV;
+    }
+}
+NGINX_CONF
+
+exec nginx -g 'daemon off;'