Changes for docker end point

Dockerfile

@@ -16,6 +16,10 @@ RUN apt-get -qq update && \
       unzip \
       wget
 
+COPY ./healthcheck.sh /usr/bin/
+HEALTHCHECK --interval=300s --timeout=75s --start-period=30s --retries=3 \
+    CMD ["/usr/bin/healthcheck.sh"]
+
 # Configure sccache
 ENV SCCACHE_VERSION=0.5.4
 RUN wget -q https://github.com/mozilla/sccache/releases/download/v${SCCACHE_VERSION}/sccache-v${SCCACHE_VERSION}-x86_64-unknown-linux-musl.tar.gz \

healthcheck.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -e
+
+head () {
+    polkadot-js-api --ws ws://127.0.0.1:9944 query.system.number 2>/dev/null |\
+        tail -3 |\
+        jq -r .number
+}
+
+start=$(head)
+sleep 60
+end=$(head)
+
+[ "$start" != "$end" ]