fix(infra): install curl in runtime image for health checks

- Alpine-based aspnet image doesn't include curl
- Health check requires curl to test /health endpoint

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

GermanApp/Dockerfile

@@ -36,6 +36,9 @@ FROM build AS publish
 FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS runtime
 WORKDIR /app
 
+# Install curl for health checks (Alpine-based image doesn't include it)
+RUN apk add --no-cache curl
+
 # Copy published app from publish stage
 COPY --from=publish /app/publish .
 
@@ -48,7 +51,7 @@ ENV ASPNETCORE_ENVIRONMENT=Production
 EXPOSE 8080
 
 # Health check
-HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
     CMD curl -f http://localhost:8080/health || exit 1
 
 # Entry point