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Merge pull request #881 from cisagov/rh/m1-docker-troubleshooting

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881 - Troubleshooting notes for M1 Mac puppeteer issue
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@ -18,9 +18,19 @@ If you're new to Django, see [Getting Started with Django](https://www.djangopro
Visit the running application at [http://localhost:8080](http://localhost:8080).
Note: If you are using Windows, you may need to change your [line endings](https://docs.github.com/en/get-started/getting-started-with-git/configuring-git-to-handle-line-endings). If not, you may not be able to run manage.py.
### Troubleshooting
* If you are using Windows, you may need to change your [line endings](https://docs.github.com/en/get-started/getting-started-with-git/configuring-git-to-handle-line-endings). If not, you may not be able to run manage.py.
* Unix based operating systems (like macOS or Linux) handle line separators [differently than Windows does](https://superuser.com/questions/374028/how-are-n-and-r-handled-differently-on-linux-and-windows). This can break bash scripts in particular. In the case of manage.py, it uses *#!/usr/bin/env python* to access the Python executable. Since the script is still thinking in terms of unix line seperators, it may look for the executable *python\r* rather than *python* (since Windows cannot read the carriage return on its own) - thus leading to the error `usr/bin/env: 'python\r' no such file or directory`
* If you'd rather not change this globally, add a `.gitattributes` file in the project root with `* text eol=lf` as the text content, and [refresh the repo](https://docs.github.com/en/get-started/getting-started-with-git/configuring-git-to-handle-line-endings#refreshing-a-repository-after-changing-line-endings)
* If you are using a Mac with a M1 chip, and see this error `The chromium binary is not available for arm64.` or an error involving `puppeteer`, try adding this line below into your `.bashrc` or `.zshrc`.
```
export DOCKER_DEFAULT_PLATFORM=linux/amd64
```
When completed, don't forget to rerun `docker-compose up`!
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