CI: check that the changelog is populated on each pull request #320

Job	Run time
build-container-image	13s
Build dev-env (ubuntu-20.04)	1m 37s
Build dev-env (ubuntu-22.04)	1m 39s
Build dev-env (ubuntu-24.04)	1m 39s
Build dev-env (ubuntu-24.10)	1m 37s
Build dev-env (debian-bullseye)	1m 39s
Build dev-env (debian-bookworm)	1m 40s
Build dev-env (debian-trixie)	1m 24s
Build dev-env (fedora-39)	33s
Build dev-env (fedora-40)	32s
Build dev-env (fedora-41)	38s
	13m 11s

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