Add support for experimental image based on Alpine Linux

[eduardo010174]

• Image build correctly
• All modules for python install correctly
• Error detected on pybluemonday on runtime.

Traceback (most recent call last):
  File "/opt/CTFd/ping.py", line 10, in <module>
    from CTFd.config import Config
  File "/opt/CTFd/CTFd/__init__.py", line 19, in <module>
    from CTFd.plugins import init_plugins
  File "/opt/CTFd/CTFd/plugins/__init__.py", line 9, in <module>
    from CTFd.utils.config.pages import get_pages
  File "/opt/CTFd/CTFd/utils/config/pages.py", line 8, in <module>
    from CTFd.utils.security.sanitize import sanitize_html
  File "/opt/CTFd/CTFd/utils/security/sanitize.py", line 1, in <module>
    from pybluemonday import UGCPolicy
  File "/opt/venv/lib/python3.9/site-packages/pybluemonday/__init__.py", line 5, in <module>
    from pybluemonday.bluemonday import ffi, lib
ImportError: Error relocating /opt/venv/lib/python3.9/site-packages/pybluemonday/bluemonday.cpython-39-x86_64-linux-gnu.so: free: initial-exec TLS resolves to dynamic definition in /opt/venv/lib/python3.9/site-packages/pybluemonday/bluemonday.cpython-39-x86_64-linux-gnu.so

Probably it's this error.
(golang/go#54805)

After I have time, I will open Issue on (https://github.com/ColdHeat/pybluemonday) for track this problem.

[codecov]

Codecov Report

Merging #2252 (d2d64ab) into master (2a6f47d) will not change coverage.
The diff coverage is n/a.

❗ Current head d2d64ab differs from pull request most recent head 4940671. Consider uploading reports for the commit 4940671 to get more accurate results

@@           Coverage Diff           @@
##           master    #2252   +/-   ##
=======================================
  Coverage   87.61%   87.61%           
=======================================
  Files         145      145           
  Lines        8858     8858           
=======================================
  Hits         7761     7761           
  Misses       1097     1097           

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