tests

Reenable `eagerCache` in tests for plain LuaTeX #3188

Job	Run time
Style check (expl3)	24s
Style check (Line length)	27s
Style check (Lua)	47s
Style check (Python)	16s
Style check (Markdown)	30s
Style check (Bash)	6s
Style check (Tabs and spaces)	5s
Type check (Python)	32s
Build Docker image (latest)	2m 20s
Test Docker image (latest)	57m 42s
Publish Docker image	0s
Publish artefacts and create a prerelease	0s
Automatically merge pull request	0s
	1h 3m 9s

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