tests

Add `.explcheckrc` #3227

Job	Run time
Style check (Line length)	30s
Style check (Python)	22s
Style check (expl3)	18s
Style check (Lua)	34s
Style check (Markdown)	22s
Style check (Bash)	4s
Style check (Tabs and spaces)	2s
Type check (Python)	41s
Build Docker image (TL2023-historic, false)	13m 4s
Build Docker image (latest, false)	15m 53s
Test Docker image (TL2023-historic, false)	1h 30m 21s
Test Docker image (latest, false)	1h 29m 27s
Publish Docker image (TL2023-historic, false)	2m 11s
Publish artefacts and create a prerelease (TL2023-historic, false)	1m 25s
Automatically merge pull request	0s
Publish Docker image (latest, false)	1m 41s
Publish artefacts and create a prerelease (latest, false)	12m 10s
	3h 49m 5s

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