Run mypy in CI on the sydent package

.github/workflows/mypy.yml

@@ -0,0 +1,15 @@
+name: Mypy
+on:
+  pull_request:
+  push:
+    branches: ["main"]
+jobs:
+  mypy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: '3.6'
+      - run: python -m pip install -e .[dev]
+      - run: mypy

changelog.d/416.misc

@@ -0,0 +1 @@
+Run mypy on the sydent package as part of CI.

pyproject.toml

@@ -44,6 +44,18 @@ target-version = ['py36']
 plugins = "mypy_zope:plugin"
 show_error_codes = true
 namespace_packages = true
+strict = true
+
+files = [
+    # Find files that pass with
+    #     find sydent tests -type d -not -name __pycache__ -exec bash -c "mypy --strict '{}' > /dev/null"  \; -print
+    "sydent/users",
+    # TODO the rest of CI checks these---mypy ought to too.
+    # "tests",
+    # "matrix_is_test",
+    # "scripts",
+    # "setup.py",
+]
 
 [[tool.mypy.overrides]]
 module = [
@@ -53,9 +65,10 @@ module = [
     "OpenSSL",
     "prometheus_client",
     "phonenumbers",
+    "sentry_sdk",
     "signedjson.*",
     "sortedcontainers",
-    "unpaddedbase64"
+    "unpaddedbase64",
 ]
 ignore_missing_imports = true