feat(docker): add healthcheck (#1142)

Dockerfile.multiarches

@@ -54,3 +54,5 @@ COPY var/helper-actions/* /usr/bin/
 USER olivetin
 
 ENTRYPOINT [ "/usr/bin/OliveTin" ]
+
+HEALTHCHECK CMD curl -fsS "http://127.0.0.1:${PORT:-1337}/readyz"

Dockerfile.singlearch

@@ -46,3 +46,5 @@ COPY var/helper-actions/* /usr/bin/
 USER olivetin
 
 ENTRYPOINT [ "/usr/bin/OliveTin" ]
+
+HEALTHCHECK CMD curl -fsS "http://127.0.0.1:${PORT:-1337}/readyz"