Place `filename` into `structured_metadata` #321

Job	Run time
PR / Check against ignorelist	4s
PR / Quality Checks / Check the CHARMHUB_TOKEN secret	1s
PR / Quality Checks / Inclusive naming / check	7s
PR / Quality Checks / Linting / Lint	9s
PR / Quality Checks / Scenario Tests / Scenario tests	22s
PR / Quality Checks / Static Analysis / Static Analysis of Charm	19s
PR / Quality Checks / Static Analysis / Static Analysis of Libs	18s
PR / Quality Checks / Unit Tests / Unit tests	23s
PR / Quality Checks / Check libraries	23s
PR / Quality Checks / CodeQL analysis / Analyze (python)	2m 9s
PR / Quality Checks / Integration Tests / Integration Tests	15m 12s
	19m 27s

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