Build

Add markdownlint workflow #1918

Job	Run time
test-declarative-configuration-run	39s
build (macos-latest)	57s
build (ubuntu-latest)	32s
build (windows-latest)	1m 12s
link-check / link-check	16s
markdown-lint-check / markdown-lint-check	14s
required-status-check	2s
	3m 52s

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