add a file documenting release blockers.

diff --git a/RELEASE_BLOCKERS.md b/RELEASE_BLOCKERS.md
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+This is a list of known release blockers for Bugzilla Harmony, in prority list order.
+
+# MySQL compatibility & checksetup
+
+We can and should only support current and previous releases of MySQL. 
+People coming from MySQL 5.6 or earlier should be nudged to use utf8mb4, which allows for emojis
+and some obscure languages.
+
+Currently harmony will work with MariaDB 10+ (any version), 
+but will not function in MySQL 8 due to the word "groups" becoming a reserved word.
+
+Checksetup needs to be updated help the user understand if their mysql can work.
+
+For MySQL 8, either:
+- We commit to supporting mysql 8
+- We detect mysql 8 and direct the user to use either mysql 5.7 or mariadb
+
+The later option is not very pleasant. 
+I believe the code I wrote over a year ago could allow us to support mysql 8, and that's in [this branch](https://github.com/bugzilla/harmony/blob/dylan/mysql-8)
+
+# Upgrade Path from 4.4 & 5.0
+
+Code must be added to Bugzilla::DB::Install to support upgrading existing schemas from 4.4 and 5.0 installs.
+
+Things to check:
+- Multiple aliases was reverted and we'll have to have code to handle that.
+- (TODO, I'm sure someone will make a suggestion)
+
+# Merge or Re-Apply the Email Code from 5.0
+
+Bugzilla Harmony's email code is from BMO, which was 4.2.
+In 5.0 or so, the email code was refactored to use a much better supported email module (Email::Sender, I think)
+
+We need to merge that change back in, or just write the code over again.
+
+# Postgresql Compatibility
+
+I think most of the postgres incompatibility is in the "BMO" extension, and in order to be able to 
+release I now believe we should remove the BMO extension from our codebase.
+This is unfortunate because it has a lot of useful features, but given resource constraints it is the best move.
+
+# Sensible, Default Logging Configuration
+
+Bugzilla::Logging controls how the application logs. It has support for defaults, but those defautls
+were written for BMO and don't make sense for the app. 
+
+This is left a bit vague, but here's the guiding principal: when you install bugzilla it needs to log in
+a place you expect it to.
+
+# Docker and Containerization
+
+I would like the Dockerfile to be rewritten such that the ENTRYPOINT is the bugzilla.pl script, so that
+the container can be used as a drop in replacement for the bugzilla.pl executable.
+
+It would be good to add sub-commands for checksetup and the jobqueue to this.
+bugzilla.pl sub-commands can be defined in the Bugzilla::App::Cmd::* namespace.
+
+If we release harmony and it has a good (amd small!) container, it will look good.
+
+