docker image with qreader, 2nd image without qreader

- organize imports
- add qreader pytest.mark
- relaxed mode for pytest
- run tests in docker
- more tests

Dockerfile

@@ -1,10 +1,11 @@
-FROM python:3.11-alpine
+FROM python:3.11-slim-bullseye
 
 WORKDIR /extract
 
 COPY . .
 
-RUN pip install -r requirements.txt
+RUN apt-get update && apt-get install -y libzbar0 python3-opencv \
+    && pip install -r requirements.txt
 
 WORKDIR /files