Add healthcheck to docker amd64

docker/Dockerfile

@@ -1,6 +1,7 @@
 FROM frolvlad/alpine-glibc:glibc-2.28
 WORKDIR /app
-RUN apk add --no-cache ca-certificates tzdata
+RUN apk add --no-cache ca-certificates tzdata curl
 ADD gotify-app /app/
+HEALTHCHECK --interval=30s --timeout=5s --start-period=5s CMD curl --fail http://localhost:80/health || exit 1
 EXPOSE 80
 ENTRYPOINT ["./gotify-app"]