Upload image to gist.md

Check your github credentials.

If you log in via twitter, you will have to do the "reset password" ceremony https://github.com/password_reset

Set up .gitconfig to use proxy

Per https://stackoverflow.com/a/34258338/148889 , set up .gitconfig by doing these at the command prompt

git config --global http.sslVerify false
git config --global https.sslVerify false
git config --global http.proxy http://user:pass@yourproxy:port
git config --global https.proxy http://user:pass@yourproxy:port

Upload image

Per https://stackoverflow.com/a/43150165/148889

1. Create a dummy gist called "my-image.jpg". Add some text (eg. "TODO"), and publish. Take note of the hash.

2. Clone your gist:

    git clone https://gist.github.com/<hash>.git

3. Add your image to your gist's repository:

    cp /path/to/my-image.jpg <hash>
    cd <hash>
    git add my-image.jpg

4. Commit the image:

    git commit -m "adding my image to my gist"

5. Update gist by pushing your modifications:

    git push origin master

At this point you will be prompted for your github/gist credentials. Use the stuff you set up in Step 1