feat: set HEALTHCHECK directive in docker

Signed-off-by: WoodenMaiden <yann.pomie@laposte.net>

Dockerfile

@@ -63,7 +63,7 @@ RUN mix release
 FROM ${RUNNER_IMAGE}
 
 RUN apt-get update -y && \
-  apt-get install -y libstdc++6 openssl libncurses5 locales ca-certificates \
+  apt-get install -y libstdc++6 openssl libncurses5 locales wget ca-certificates \
   && apt-get clean && rm -f /var/lib/apt/lists/*_*
 
 # Set the locale
@@ -89,4 +89,9 @@ USER nobody
 # above and adding an entrypoint. See https://github.com/krallin/tini for details
 # ENTRYPOINT ["/tini", "--"]
 
+EXPOSE 8080
+
+HEALTHCHECK --interval=5s --timeout=10s --start-period=5s --retries=3 \
+  CMD "wget -O http://localhost:8080/health/live 2> /dev/null"
+
 CMD ["/app/bin/server"]