txoo: healthcheck based on latest block

- fail if latest attestation is more than a block behind
Signed-off-by: Lakshya Singh <lakshay.singh1108@gmail.com>

txood/Dockerfile

@@ -30,14 +30,22 @@ RUN apk update && \
       build-base \
       bind-tools \
       libev-dev \
-      curl-dev
+      curl-dev \
+      curl \
+      jq
 
 COPY --from=builder /usr/local/bin/txood /usr/bin/txood
 
 COPY entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
 
+COPY healthcheck.sh /healthcheck.sh
+RUN chmod +x /healthcheck.sh
+
 VOLUME ["${TXOO_DATA}"]
 
+HEALTHCHECK --interval=5s --timeout=10s --start-period=5s \
+    CMD ["/bin/sh", "-c", "/healthcheck.sh"]
+
 ENTRYPOINT ["/entrypoint.sh"]
 CMD ["txood"]