proxies: allow POST for forge

Some folks were getting posts failing against forge.
See https://forge.fedoraproject.org/forge/forge/issues/401

So, lets just explicitly allow POSTs through anubis as
this should be fine for normal people and should not be something
that scrapers normally do.

Signed-off-by: Kevin Fenzi <kevin@scrye.com>

roles/anubis/templates/policies.yaml.j2

@@ -15,6 +15,9 @@ bots:
   - name: bodhi and badges rss feeds
     path_regex: /rss/
     action: ALLOW
+  - name: allow POSTs
+    expression: method == "POST"
+    action: ALLOW
   - name: allow ostree
     path_regex: ^/ostree
     action: ALLOW