default pattern fixes (#963)

* feat(checker): allow png/gif/jpg/jpeg/svg favicons as well as ico

* changelog: add updates to keep-internet-working.yaml

* fix(checker): tighten default regex patterns for well-known files

* changelog: add updates to regular expression patterns in keep-internet-working.yaml

---------

Signed-off-by: Elliot Speck <11192354+arcayr@users.noreply.github.com>

data/common/keep-internet-working.yaml

@@ -1,13 +1,13 @@
 # Common "keeping the internet working" routes
 - name: well-known
-  path_regex: ^/.well-known/.*$
+  path_regex: ^/\.well-known/.*$
   action: ALLOW
 - name: favicon
-  path_regex: ^/favicon.(?:ico|png|gif|jpg|jpeg|svg)$
+  path_regex: ^/favicon\.(?:ico|png|gif|jpg|jpeg|svg)$
   action: ALLOW
 - name: robots-txt
-  path_regex: ^/robots.txt$
+  path_regex: ^/robots\.txt$
   action: ALLOW
 - name: sitemap
-  path_regex: ^/sitemap.xml$
+  path_regex: ^/sitemap\.xml$
   action: ALLOW

docs/docs/CHANGELOG.md

@@ -33,6 +33,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - A standard library HTTP server log message about HTTP pipelining not working has been filtered out of Anubis' logs. There is no action that can be taken about it.
 - The default `favicon` pattern in `data/common/keep-internet-working.yaml` has been updated to permit requests for png/gif/jpg/svg files as well as ico.
 - The `--cookie-prefix` flag has been fixed so that it is fully respected.
+- The default patterns in `data/common/keep-internet-working.yaml` have been updated to appropriately escape the '.' character in the regular expression patterns.
 
 ### Breaking changes