add blog post for the new secret plugin protocol

[VinozzZ]

What does this change

This PR adds a new blog post for the new secret plugin protocol

What issue does it fix

Closes #2093

Notes for the reviewer

This should only be merged after getporter/examples#10 is merged and the example bundle is published

Checklist

• Did you write tests?
• Did you write documentation?
• Did you change porter.yaml or a storage document record? Update the corresponding schema file.
• If this is your first pull request, please add your name to the bottom of our Contributors list. Thank you for making Porter better! 🙇‍♀️

Reviewer Checklist

• Comment with /azp run test-porter-release if a magefile or build script was modified
• Comment with /azp run porter-integration if it's a non-trivial PR

[carolynvs]

Yay! I can't wait for us to announce your new security feature. 🚀

[carolynvs]

@VinozzZ Sorry I didn't catch this sooner. Our website, porter.sh, is published from the main branch. So if we want to point people to https://porter.sh/blog/your-blog-post, this PR needs to be against the main branch.

There are two ways to fix this.

1. Rebase your PR against main and then I'll merge that into main. Then in my next "sync" PR it will get copied into release/v1.
2. Merge the PR as-is and you can submit another PR against main with a cherry-pick of this commit.

Which would you like to do?

[VinozzZ]

@VinozzZ Sorry I didn't catch this sooner. Our website, porter.sh, is published from the main branch. So if we want to point people to https://porter.sh/blog/your-blog-post, this PR needs to be against the main branch.

There are two ways to fix this.

1. Rebase your PR against main and then I'll merge that into main. Then in my next "sync" PR it will get copied into release/v1.

2. Merge the PR as-is and you can submit another PR against main with a cherry-pick of this commit.

Which would you like to do?

I rebased it against main