add healthcheck to kontor-api and docker-compose.yml

kontor-api/Dockerfile

@@ -1,7 +1,7 @@
 ## ------------------------------- Builder Stage ------------------------------ ## 
 FROM python:3.13-bookworm AS builder
 
-RUN apt-get update && apt-get install --no-install-recommends -y build-essential  && \
+RUN apt-get update && apt-get install --no-install-recommends -y build-essential && \
     apt-get clean && rm -rf /var/lib/apt/lists/*
 
 # Download the latest installer, install it and then remove it
@@ -34,6 +34,8 @@ FROM python:3.13-slim-bookworm AS production
 
 #RUN --mount=type=secret,id=secret-key,target=secrets.json
 
+RUN apt-get update && apt-get install --no-install-recommends -y curl
+
 RUN useradd --create-home appuser
 USER appuser