Document blog post review process
It's become apparent over the last weeks that we don't really have a well defined process for blog posts, who reviews them, how, and what the requirements for merging are.
For edge posts, it is agreed that they can go in with zero reviews (push directly to master), although a review is also fine (depending on the issue and who is writing the post). This is fine.
I discussed a bit with Ollie today, and for the main site we want to propose some kind of process to help us get things done more efficiently.
For a new blog post, the author should open the MR as a draft and request reviews from folks who should be involved in authorship (e.g. for the systemd blog post this would be me and maybe Clayton and Ollie). This shouldn't be a fixed list and it can be changed - if you think it's important that you provide feedback to a blog post then you should assign yourself as a reviewer.
At this stage, the blog post structure and contents might change a lot, as was the case for !261 (merged) for example. We should avoid leaving reviews to address spelling, grammar, and punctuation (SPAG) at this point as it might become irrelevant on the next iteration.
Once there is general agreement over the structure and content, the post should be unmarked as draft. At this point SPAG reviews are acceptable.
The blog post is ready to merge once the requested reviewers have approved it, it will then go through Ollie who will do a final check before merging the post and making a mastodon announcement.
In general, we should aim to avoid having too many folks reviewing a blog post, it can quickly spiral and result in a lot of additional effort by the author. It is also generally not useful to get approvals on a post by someone who hasn't previously left feedback (unless that person is marked as a reviewer -- in which case their approval is explicitly requested).
Regarding SPAG reviews, we could use GitLab approval rules to dictate that some folks take on the role of checking for these things, in which case an approval from them will show up as an approval for SPAG specifically.
Let's discuss this proposal, and aim to come up with a version we can document on the wiki.