feat(docker): add healthcheck to monitor application status (#172)

Author: dan-online

Dockerfile

@@ -1,12 +1,14 @@
 ARG IMAGE_TAG=3.21
-FROM --platform=$TARGETPLATFORM ghcr.io/linuxserver/baseimage-alpine:${IMAGE_TAG} AS runtime
+FROM ghcr.io/linuxserver/baseimage-alpine:${IMAGE_TAG} AS runtime
 
 WORKDIR /app
 
 COPY ./autopulse /bin
 
 ENV S6_AUTOPULSE_DIR=/etc/s6-overlay/s6-rc.d/svc-autopulse
 
+HEALTHCHECK --interval=10s --timeout=5s --start-period=5s --retries=3 CMD wget --quiet --tries=1 --spider http://127.0.0.1:${AUTOPULSE__APP__PORT:-2875}/stats || exit 1
+
 RUN mkdir -p $S6_AUTOPULSE_DIR && \
     echo '#!/usr/bin/with-contenv bash' >> $S6_AUTOPULSE_DIR/run && \
     echo '# shellcheck shell=bash' >> $S6_AUTOPULSE_DIR/run && \