Check that shell access is unrestricted before attempting shell escape #2469

Job	Run time
Style check (Lua)	51s
Style check (Markdown)	48s
Style check (Bash)	3s
Style check (Python)	25s
Type check (Python)	38s
Build Docker image (TL2022-historic)	10m 37s
Build Docker image (latest)	10m 39s
Test Docker image (TL2022-historic)	37m 7s
Test Docker image (latest)	15m 49s
Automatically merge pull request	10s
Publish Docker image	0s
Publish artefacts and create a prerelease	0s
	1h 17m 7s

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