Fix tox issues

• Do not install ldap dependencies
• Do not reformat migrations

tox.ini

@@ -9,8 +9,6 @@ whitelist_externals = poetry
 skip_install = true
 envdir = {toxworkdir}/globalenv
 commands_pre =
-     - sudo apt update
-     - sudo apt install python3-ldap libldap2-dev libssl-dev libsasl2-dev python3.7-dev -y
      - poetry install
 commands =
     - poetry run pytest --cov=. {posargs} aleksis/
@@ -43,7 +41,7 @@ commands = poetry run make -C docs/ html {posargs}
 [testenv:reformat]
 commands =
     poetry run isort -rc aleksis/
-    poetry run black aleksis/
+    poetry run black --exclude "migrations" aleksis/
 
 [flake8]
 max_line_length = 100
@@ -58,6 +56,7 @@ use_parantheses = 1
 default_section = THIRDPARTY
 known_first_party = aleksis
 known_django = django
+skip = migrations
 sections = FUTURE,STDLIB,DJANGO,THIRDPARTY,FIRSTPARTY,LOCALFOLDER
 
 [mypy]