Add linter for checking blog posts

[raeidish]

Description

Closes #2432.

Added linter in tools/checkdocs that verifies slugs in markdown files. Would love to get some feedback on the changes

Readiness checklist

• I added/updated unit tests.
• I added/updated integration/compatibility tests.
• I added/updated comments and checked rendering.
• I made spot refactorings.
• I updated user documentation.
• I ran task all, and it passed.
• I ensured that PR title is good enough for the changelog.
• (for maintainers only) I set Reviewers (@FerretDB/core), Labels, Project and project's Sprint fields.
• I marked all done items in this checklist.

[CLAassistant]

All committers have signed the CLA.

[AlekSi]

Would love to get some feedback on the changes

Then please mark this PR as ready for review

[codecov]

Codecov Report

Merging #2459 (3ac01a5) into main (cf67017) will increase coverage by 0.02%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2459      +/-   ##
==========================================
+ Coverage   27.02%   27.05%   +0.02%     
==========================================
  Files         400      400              
  Lines       19776    19776              
==========================================
+ Hits         5345     5350       +5     
+ Misses      13865    13861       -4     
+ Partials      566      565       -1     

see 2 files with indirect coverage changes

Flag	Coverage Δ
integration	5.11% <ø> (ø)
mongodb	5.11% <ø> (ø)
unit	25.65% <ø> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

[mergify]

@raeidish this pull request has merge conflicts.

[raeidish]

Ready for another review @AlekSi

[AlekSi]

Please click those

[chilagrow]

Very minor comments. Looking good 🤗

[chilagrow]

Could you run task lint and fix the warnings of that please? 🤗

[raeidish]

Could you run task lint and fix the warnings of that please? hugs

@chilagrow what linting errors are you getting? because apparently I'm not getting any.

works on my machine 😁

[chilagrow]

Could you run task lint and fix the warnings of that please? hugs

@chilagrow what linting errors are you getting? because apparently I'm not getting any.

works on my machine grin

That's interesting, below is what I see from task lint @raeidish 🤔

task lint

bin/task lint
task: [lint] bin/golangci-lint run --config=.golangci.yml
task: [lint] bin/golangci-lint run --config=.golangci-new.yml
task: [lint] bin/go-consistent -pedantic ./cmd/... ./internal/... ./build/... ./ferretdb/...
task: [lint] bin/go-sumtype ./...
task: [lint] go vet -vettool=./bin/checkswitch ./...
task: [lint] bin/task -d integration integration-lint
task: [integration-lint] ../bin/golangci-lint run --config=.golangci.yml
task: [integration-lint] ../bin/golangci-lint run --config=.golangci-new.yml
task: [integration-lint] ../bin/go-consistent -pedantic ./...
task: [integration-lint] ../bin/go-sumtype ./...
task: [integration-lint] go vet -vettool=../bin/checkswitch ./...
task: [lint] bin/task -d tools tools-lint
task: [tools-lint] ../bin/golangci-lint run --config=../.golangci.yml ./checkdocs/... ./checkswitch/...
task: [tools-lint] ../bin/golangci-lint run --config=../.golangci-new.yml ./checkdocs/... ./checkswitch/...
Error: checkdocs/checkdocs.go:15:1: package-comments: should have a package comment (revive)
package main
task: Failed to run task "tools-lint": exit status 1
task: Failed to run task "tools-lint": exit status 1
task: Failed to run task "lint": exit status 201
task: Failed to run task "lint": exit status 201
^
Error: checkdocs/checkdocs.go:37:2: only one cuddle assignment allowed before if statement (wsl)
	if err != nil {
	^
Error: checkdocs/checkdocs.go:43:2: only one cuddle assignment allowed before range statement (wsl)
	for _, slug := range slugs {
	^
Error: checkdocs/checkdocs.go:72:2: only one cuddle assignment allowed before range statement (wsl)
	for _, f := range fs {
	^
Error: Process completed with exit code 201.

[chilagrow]

Great work! This is already helping us to identify file name and slug mismatch.

[w84thesun]

LGTM! Thanks for your contribution! 👍