Add .dockerignore file (google#520)

lszekeres · web-flow · commit 252fb5d93cec · 2020-07-13T14:51:09.000-04:00
To optimize docker build contexts.
diff --git a/.dockerignore b/.dockerignore
@@ -0,0 +1,11 @@
+*.pyc
+*.pyd
+*.pyo
+.git
+.pytest_cache
+.pytype
+.venv
+__pycache__
+docs
+report*
+third_party/oss-fuzz/build
