Lower healthcheck interval to 20s

Author: namedgraph

Dockerfile

@@ -180,7 +180,7 @@ RUN useradd --no-log-init -U ldh && \
 
 RUN ./import-letsencrypt-stg-roots.sh
 
-HEALTHCHECK --start-period=80s --interval=30s --timeout=10s \
+HEALTHCHECK --start-period=80s --interval=20s --timeout=10s \
     CMD curl -f -I "http://localhost:${HTTP_PORT}/ns" -H "Accept: application/n-triples" || exit 1 # relies on public access to the namespace document
 
 USER ldh