add docs

Author: sanderegg

services/dynamic-sidecar/Dockerfile

@@ -196,6 +196,9 @@ COPY --chown=scu:scu --from=prod-only-deps  ${DYNAMIC_SIDECAR_DY_VOLUMES_MOUNT_D
 COPY --chown=scu:scu services/dynamic-sidecar/docker services/dynamic-sidecar/docker
 RUN chmod +x services/dynamic-sidecar/docker/*.sh
 
+# NOTE: the start period of 3 minutes is to allow the dynamic-sidecar
+# enough time to connect to the externald dependencies. some times the docker
+# networks take time to get created
 # https://docs.docker.com/reference/dockerfile/#healthcheck
 HEALTHCHECK \
   --interval=10s \