update ci

update dockerfile and versions

Merge branch 'main' of github.com:XieGuochao/csapp into main

sync with arm64 Dockerfile

update arm64 cpp-tools

add "fuck" extension

add markdown and material theme extensions

Merge pull request #3 from XieGuochao/b2

Fix conflicts and make extensions folder

upgrade code server v3.10.2 but PDF extension fail

Merge pull request #1 from 134ARG/add_pdf_extension

Add pdf extension