returned back curl to iso

src/Nocr.TextMatcher.Host/Dockerfile

@@ -1,5 +1,9 @@
 FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
 WORKDIR /app
+# Install curl for healthcheck
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends curl && \
+    rm -rf /var/lib/apt/lists/*
 EXPOSE 80
 EXPOSE 443