fix: correct Dockerfile for pywb

Author: luandro

services/pywb/Dockerfile

@@ -4,4 +4,5 @@ COPY start.sh /tmp
 ENTRYPOINT ["sh", "/tmp/start.sh"]
 COPY config.yaml /webarchive/config.yaml
 COPY head_insert.html /tmp/head_insert.html
+RUN mkdir -p /webarchive/templates/
 RUN cat /tmp/head_insert.html >> /webarchive/templates/head_insert.html