Fix gunicorn workers booting by modifying Dockerfile to use python bullseye

[northwestwitch]

Fix #41, fix #44

How to test:

• Deploy on cg-vm1 stage and see

Expected outcome:

• [x] Hope it works!

Review:

• [x] Code approved by DN
• [x] Tests executed by DN

This version is a:

• [ ] MAJOR - when you make incompatible API changes
• [ ] MINOR - when you add functionality in a backwards compatible manner
• [x] PATCH - when you make backwards compatible bug fixes or documentation/instructions

[dnil]

Looks good as far as the cpu-spikes go.

I dont see connectivity with scout though: