Add bookmark options to load username/password from env vars

[jenbroek]

We keep our configuration for pgweb in a private Git repository. Currently we still have to input the username and password every time, but it would be nice to refer to an environment variable in the bookmarks. That'll allow us to have the 'click-and-go' functionality without the security implications of keeping passwords stored in the repository itself. Using SSH keys is unfortunately not an option.

[sosedoff]

Is https://github.com/AGWA/git-crypt not an option? You can securely store the encrypted data right in your repo

[jenbroek]

Thanks for the quick reply. git-crypt isn't suitable for us I'm afraid; we'd like to use existing Kubernetes secrets to specify username/password. I opened this PR in case this might be of value to you or other users of pgweb, but I also understand this is a very specific situation 😅

[sosedoff]

Thank you!

[jenbroek]

Likewise, and thanks for the great tool!

[sosedoff]

Would you mind dropping me an email with some info on how you run pgweb in your org? This helps me plan for new features/improve things etc.