You can login to your github account and then navigate to gist.github.com/ and create your code snippet and in the created snippet, you will see clone via ssh option for the embed dropdown like this
Copy the url and clone that as a git repository on your machine and then you can push your images to that repository and once pushed you can click on the raw button displayed for image and use that url to include image while creating new post in dev.to using the way we include image in markdown
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You can login to your github account and then navigate to gist.github.com/ and create your code snippet and in the created snippet, you will see clone via ssh option for the embed dropdown like this
Copy the url and clone that as a git repository on your machine and then you can push your images to that repository and once pushed you can click on the raw button displayed for image and use that url to include image while creating new post in dev.to using the way we include image in markdown