Add db/migrations/env.py to MANIFEST.in

This fixes a warning I have with packaging where this file would get
installed in the wrong place (/usr/mediagoblin/env.py).

Signed-off-by: Ben Sturmfels <ben@sturm.com.au>

AUTHORS

@@ -44,6 +44,7 @@ Thank you!
 * Derek Moore
 * Duncan
 * Duncan Paterson
+* Elisei Roca
 * Elrond of Samba TNG
 * Emily O'Leary
 * Fernando Gutierrez

MANIFEST.in

@@ -14,6 +14,7 @@ recursive-include mediagoblin/media_types/video/migrations *.py
 include mediagoblin.example.ini mediagoblin/config_spec.ini paste.ini
 include mediagoblin/config_spec.ini
 include mediagoblin/db/migrations/alembic.ini
+include mediagoblin/db/migrations/env.py
 graft extlib
 graft licenses
 graft devtools

docs/source/siteadmin/relnotes.rst

@@ -23,6 +23,7 @@ This chapter has important information about our current and previous releases.
 =========================
 
 - Extend left/right arrow key navigation to paginated views [#5627] (Olivier Mehani)
+- Fix incorrect setuptools install location for db/migrations/env.py (Elisei Roca)
 
 ..
    **To do:**

setup.cfg

@@ -92,8 +92,3 @@ zc.buildout =
     make_user_dev_dirs = mediagoblin.buildout_recipes:MakeUserDevDirs
 babel.extractors =
     jinja2 = jinja2.ext:babel_extract
-
-[options.data_files]
-# Running gmg dbupdate fails with missing env.py because env.py isn't
-# being included in the Python package (no __init__.py).
-mediagoblin = mediagoblin/db/migrations/env.py