sphinx-copybutton
                                
                                 sphinx-copybutton copied to clipboard
                                
                                    sphinx-copybutton copied to clipboard
                            
                            
                            
                        Failed build in RTD for extension sphinx-copybutton
Describe the bug
Context This is the duplicate question from this Github report
Error
Error in RTD
Could not import extension sphinx_copybutton (exception: No module named 'sphinx_copybutton')
Issue
I got the same issue as the reporter where the copy icon is works on local but failed when uploading in RTD. In the article above stated need to follow this RTD Build and this Config V2.
Then i created the .readthedocs.yaml and requirement.txt. So is it both .yaml and .txt are in wrong dir or missing context?

Reproduce the bug
- pip install sphinx-copybutton
- In the conf.pyadd this extensions = [ ... 'sphinx_copybutton' ... ]
- added .readthedocs.yamlandrequirement.txt
- git add -A
- git commit -m "Create xxx"
- git push
- The RTD tab Buildis failed.
List your environment
Version: 1.67.1 (user setup) Electron: 17.4.1 Chromium: 98.0.4758.141 Node.js: 16.13.0 V8: 9.8.177.13-electron.0 OS: Windows_NT x64 10.0.19044
Package (Version)
alabaster 0.7.12 appdirs 1.4.4 Babel 2.10.1 certifi 2021.10.8 charset-normalizer 2.0.12 colorama 0.4.4 docutils 0.17.1 esbonio 0.11.2 idna 3.3 imagesize 1.3.0 Jinja2 3.1.2 MarkupSafe 2.1.1 packaging 21.3 pip 22.1 pydantic 1.8.2 pygls 0.11.3 Pygments 2.12.0 pyparsing 3.0.8 pyspellchecker 0.6.3 pytz 2022.1 requests 2.27.1 setuptools 62.3.1 snowballstemmer 2.2.0 Sphinx 4.5.0 sphinx-bernard-theme 0.1.12 sphinx-copybutton 0.5.0 sphinx-rtd-theme 1.0.0 sphinxcontrib-applehelp 1.0.2 sphinxcontrib-devhelp 1.0.2 sphinxcontrib-htmlhelp 2.0.0 sphinxcontrib-jsmath 1.0.1 sphinxcontrib-qthelp 1.0.3 sphinxcontrib-serializinghtml 1.1.5 typeguard 2.13.3 typing_extensions 4.2.0 urllib3 1.26.9