adds using secrets in a python function and cli --function-credentials

[fabricebrito]

This PR adds documentation on how to use secrets in Python functions and extends the crossplane render --function-credentials=PATH cli

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[fabricebrito]

@negz this is related to our chat in https://cloud-native.slack.com/archives/C01DCV0BS9H/p1742994912658039

[negz]

Nice work! Thank you.

[negz]

@fabricebrito Can you sign your git commit please - we need that before we can merge.

See https://github.com/crossplane/docs/pull/902/checks?check_run_id=39578510287 for context.

(git commit --amend -s should do it.)

[fabricebrito]

@negz the commit is now signed

[negz]

@fabricebrito Sadly it seems like the commits aren't signed - the DCO check is still failing.

[jbw976]

@fabricebrito something odd is going on in the history of your branch it seems like. I see multiple merge commits and some of my previous commits from #900 seem to be in your branch's history now too 🤔

Have you looked into using a git rebase workflow? Since I started doing that years ago, I have largely avoided any messy branch history - I've never looked back since adopting it 😂
https://simondosda.github.io/posts/2022-01-03-git-rebase-workflow.html

From the DCO check:

There are 4 commits incorrectly signed off. This means that the author(s) of these commits failed to include a Signed-off-by line in their commit message.

All the commits in the branch must be signed off. I'm not quite sure what has happened in your branch, but it may be reasonable for you to start fresh and apply just your final changes (with a sign-off), instead of trying to continue cleaning things up.

[fabricebrito]

I'm sorry for the mess. I'll start fresh.