Enable attachment of binary files as charm resources #1240

Job	Run time
Build test (3.10)	28s
Unit tests (3.8)	26s
Unit tests (3.9)	26s
Validate (3.10)	26s
Unit tests (3.10)	25s
Unit tests (3.11)	30s
Unit tests (3.12)	27s
Unit tests (3.13)	35s
Quarantined Integration Tests (3.10, 3.1/stable)	10m 40s
Integration (3.10, 3.1/stable)	10m 29s
Quarantined Integration Tests (3.10, 3.3/stable)	10m 43s
Integration (3.10, 3.3/stable)	10m 32s
Quarantined Integration Tests (3.10, 3.4/stable)	9m 47s
Integration (3.10, 3.4/stable)	8m 19s
Quarantined Integration Tests (3.10, 3.5/stable)	10m 17s
Integration (3.10, 3.5/stable)	4m 43s
Integration (3.10, 3.6/candidate)	3m 14s
	1h 22m 27s

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