fix dockerfile and add docker ignore (#714)

* fix dockerfile and add docker ignore

* fixup comment in dockerignore

Co-authored-by: dni <dni.khr@gmail.com>

.dockerignore

@@ -0,0 +1,6 @@
+.git
+docs
+docker
+
+# ignore all the markdown
+*.md

Dockerfile

@@ -8,7 +8,7 @@ ENV PATH="$VIRTUAL_ENV/bin:$PATH"
 
 # Install build deps
 RUN apt-get update
-RUN apt-get install -y --no-install-recommends build-essential pkg-config
+RUN apt-get install -y --no-install-recommends build-essential pkg-config libpq-dev
 RUN python -m pip install --upgrade pip
 RUN pip install wheel