feat: Add Flutter-ELinux Support to Cargokit #116

Job	Run time
Build (ubuntu-latest, debug)	4m 15s
Build (ubuntu-latest, profile)	4m 29s
Build (ubuntu-latest, release)	5m 42s
Build (macOS-latest, debug)	10m 36s
Build (macOS-latest, profile)	12m 51s
Build (macOS-latest, release)	15m 8s
Build (windows-latest, debug)	7m 55s
Build (windows-latest, profile)	12m 26s
Build (windows-latest, release)	9m 46s
	1h 23m 8s

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