Solution:
1. Recon
2. Cloning git
`wget -r http://54.85.105.103/.git/`
3. Extracting commits
https://github.com/internetwache/GitTools/
4. Inviting ourselves to Slack using API
5. Enum
6. Checking the key
`chmod 600 id_rsa && ssh -i id_rsa [email protected]`
7. Looking for flag