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* ADD:
- added client_max_body_size in proxy_site.j2 template so sites may permit uploads of larger files
* MODIFY:
- modified several sites to make use of client_max_body_size option
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* MODIFY:
- modified .gitlab-ci.yml to use our newly created debian based ci image;
this commit will kick off the first test of both the image and the .gitlab-ci.yml setup