Add a config that allows for overriding ruin template variables (#1867) #7975

Job	Run time
Lint with OpenDream	33s
Collect data for other tasks	11s
Run Linters	2m 20s
Compile Maps	2m 0s
Windows Build	2m 6s
Integration Tests (boxstation) / run_integration_tests	17m 20s
Integration Tests (deltastation) / run_integration_tests	13m 12s
Integration Tests (icebox) / run_integration_tests	12m 43s
Integration Tests (kilostation) / run_integration_tests	12m 43s
Integration Tests (metastation) / run_integration_tests	12m 50s
Integration Tests (multiz_debug) / run_integration_tests	12m 18s
Integration Tests (northstar) / run_integration_tests	13m 21s
Integration Tests (runtimestation) / run_integration_tests	10m 37s
Alternate Tests (515, 1627, runtimestation) / run_integration_tests	10m 41s
Integration Tests (tramstation) / run_integration_tests	13m 27s
Check Alternate Tests	1s
Compare Screenshot Tests	1m 20s
	2h 17m 43s

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