refactor image import and add Alpine docker image

- dynamic import of QR reader
- build docker also for arm64

Pipfile

@@ -4,15 +4,11 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-protobuf = "==4.21.12"
+protobuf = "*"
 qrcode = "*"
 pillow = "*"
-wheel = "==0.38.4"
-pytest = "==7.2.0"
-flake8 = "==6.0.0"
-pylint = "==2.15.9"
-qreader = "==1.3.1"
-opencv-python = "==4.6.0.66"
+qreader = "*"
+opencv-python = "*"
 
 [dev-packages]
 pytest = "*"