Add Scout to the list of available backends #16

Job	Run time
Soundness / License headers check	2s
Soundness / API breakage check	41s
Soundness / Documentation check	54s
Soundness / Broken symlinks check	4s
Soundness / Shell check	34s
Soundness / Format check	38s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	3s
Soundness / Python lint check	4s
Cxx interop / Cxx interop / Linux (5.9)	46s
Cxx interop / Cxx interop / Linux (5.10)	46s
Cxx interop / Cxx interop / Windows (6.0)	2s
Cxx interop / Cxx interop / Linux (6.0)	52s
Cxx interop / Cxx interop / Linux (nightly-6.0)	55s
Cxx interop / Cxx interop / Windows (nightly-6.0)	1s
Cxx interop / Cxx interop / Linux (nightly-main)	56s
Cxx interop / Cxx interop / Windows (nightly-main)	1s
Unit tests / Unit tests / Windows (6.0)	11m 24s
Unit tests / Unit tests / Linux (5.9)	39s
Unit tests / Unit tests / Windows (nightly-6.0)	12m 26s
Unit tests / Unit tests / Windows (nightly-main)	12m 2s
Unit tests / Unit tests / Linux (5.10)	41s
Unit tests / Unit tests / Linux (6.0)	49s
Unit tests / Unit tests / Linux (nightly-6.0)	51s
Unit tests / Unit tests / Linux (nightly-main)	55s
	47m 8s

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