Add support for Flex target and update to the latest NBGL use cases #24

Job	Run time
Build application using the reusable workflow / Retrieve application metadata / Retrieve application metadata	5s
Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (stax)	33s
Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (flex)	36s
Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (nanosp)	38s
Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (nanox)	31s
Build application using the reusable workflow / Build application for NanoS, X, S+, and Stax (nanos)	35s
Build application using the reusable workflow / Merge build artifacts	3s
Run ragger tests using the reusable workflow / Retrieve application metadata / Retrieve application metadata	8s
Run ragger tests using the reusable workflow / Functional tests with Ragger (flex)	1m 12s
Run ragger tests using the reusable workflow / Functional tests with Ragger (nanox)	52s
Run ragger tests using the reusable workflow / Functional tests with Ragger (stax)	1m 7s
Run ragger tests using the reusable workflow / Functional tests with Ragger (nanosp)	52s
Run ragger tests using the reusable workflow / Functional tests with Ragger (nanos)	1m 10s
Run ragger tests using the reusable workflow / Merge snapshots artifacts	7s
Run ragger tests using the reusable workflow / Open a PR with the new snapshots	0s
	8m 29s

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