fix: use local registry for nginx:alpine image in Dockerfile

- Changed FROM nginx:alpine to 194.5.195.53:32082/nginx:alpine
- Fixes TLS handshake timeout when pulling from Docker Hub

src/BackOffice/Dockerfile

@@ -16,7 +16,7 @@ WORKDIR "/src/BackOffice"
 RUN dotnet publish "BackOffice.csproj" -c Release -o /app/publish
 
 # Runtime stage - nginx for Blazor WebAssembly
-FROM nginx:alpine AS final
+FROM 194.5.195.53:32082/nginx:alpine AS final
 WORKDIR /usr/share/nginx/html
 
 # Remove default nginx files