update Dockerfile

Author: gentslava

Dockerfile

@@ -1,3 +1,5 @@
+ARG DOTNET_VERSION=9.0
+
 ### BUILD JACRED MULTIARCH START ###
 FROM --platform=$BUILDPLATFORM alpine AS builder
 
@@ -11,7 +13,7 @@ RUN rm -f publish.zip
 ### BUILD JACRED MULTIARCH END ###
 
 # ### BUILD MAIN IMAGE START ###
-FROM mcr.microsoft.com/dotnet/aspnet:6.0-alpine
+FROM --platform=$BUILDPLATFORM mcr.microsoft.com/dotnet/aspnet:${DOTNET_VERSION}-alpine
 
 ENV JACRED_HOME=/home/jacred
 ENV DOTNET_SYSTEM_GLOBALIZATION_INVARIANT=false
@@ -24,6 +26,17 @@ WORKDIR $JACRED_HOME
 
 EXPOSE 9117
 
+HEALTHCHECK --interval=30s \
+    --timeout=15s \
+    --start-period=45s \
+    --retries=3 \
+    --start-interval=5s \
+    CMD wget --quiet \
+    --timeout=10 \
+    --tries=2 \
+    --spider \
+    http://localhost:9117 || exit 1
+
 VOLUME [ "$JACRED_HOME" ]
 
 ENTRYPOINT ["dotnet", "JacRed.dll"]