Place `filename` into `structured_metadata` #315

Job	Run time
PR / Check against ignorelist	1s
PR / Quality Checks / Check the CHARMHUB_TOKEN secret	1s
PR / Quality Checks / Static Analysis / Static Analysis of Charm	50s
PR / Quality Checks / Scenario Tests / Scenario tests	23s
PR / Quality Checks / Linting / Lint	10s
PR / Quality Checks / Inclusive naming / check	6s
PR / Quality Checks / Static Analysis / Static Analysis of Libs	20s
PR / Quality Checks / Unit Tests / Unit tests	22s
PR / Quality Checks / Check libraries	26s
PR / Quality Checks / CodeQL analysis / Analyze (python)	2m 19s
PR / Quality Checks / Integration Tests / Integration Tests	27m 34s
	32m 32s

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