v28: Add support for `submitpackage` #17

Job	Run time
Test - stable toolchain (minimal)	30s
Test - stable toolchain (recent)	30s
Test - 1.63.0 toolchain (minimal)	1m 14s
Docs - stable toolchain (recent)	1m 23s
Prepare	4s
Test - 1.63.0 toolchain (recent)	1m 16s
Integration tests - stable toolchain (28_0)	44s
Integration tests - stable toolchain (27_1)	58s
Integration tests - stable toolchain (27_0)	47s
Integration tests - stable toolchain (26_2)	41s
Integration tests - stable toolchain (26_1)	46s
Integration tests - stable toolchain (26_0)	43s
Integration tests - stable toolchain (25_2)	46s
Integration tests - stable toolchain (25_1)	49s
Integration tests - stable toolchain (25_0)	46s
Integration tests - stable toolchain (24_2)	45s
Integration tests - stable toolchain (24_1)	45s
Integration tests - stable toolchain (24_0_1)	41s
Integration tests - stable toolchain (23_2)	40s
Integration tests - stable toolchain (23_1)	44s
Integration tests - stable toolchain (23_0)	40s
Integration tests - stable toolchain (22_1)	45s
Integration tests - stable toolchain (22_0)	49s
Integration tests - stable toolchain (0_21_2)	53s
Integration tests - stable toolchain (0_20_2)	40s
Integration tests - stable toolchain (0_19_1)	44s
Integration tests - stable toolchain (0_18_1)	1m 4s
Integration tests - stable toolchain (0_17_1)	1m 10s
Docs - nightly toolchain (recent)	58s
Lint - nightly toolchain (recent)	38s
Test - nightly toolchain (minimal)	38s
Test - nightly toolchain (recent)	38s
	25m 9s

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