v28: Add support for `submitpackage` #19

Job	Run time
Test - 1.63.0 toolchain (minimal)	1m 14s
Test - 1.63.0 toolchain (recent)	1m 16s
Prepare	2s
Docs - stable toolchain (recent)	1m 19s
Integration tests - stable toolchain (28_0)	57s
Integration tests - stable toolchain (27_1)	41s
Test - stable toolchain (minimal)	33s
Test - stable toolchain (recent)	36s
Integration tests - stable toolchain (27_0)	41s
Integration tests - stable toolchain (26_2)	41s
Integration tests - stable toolchain (26_1)	51s
Integration tests - stable toolchain (26_0)	58s
Integration tests - stable toolchain (25_2)	42s
Integration tests - stable toolchain (25_1)	45s
Integration tests - stable toolchain (25_0)	47s
Integration tests - stable toolchain (24_2)	43s
Integration tests - stable toolchain (24_1)	43s
Integration tests - stable toolchain (24_0_1)	1m 1s
Integration tests - stable toolchain (23_2)	45s
Integration tests - stable toolchain (23_1)	54s
Integration tests - stable toolchain (23_0)	43s
Integration tests - stable toolchain (22_1)	52s
Integration tests - stable toolchain (22_0)	44s
Integration tests - stable toolchain (0_21_2)	46s
Integration tests - stable toolchain (0_20_2)	44s
Integration tests - stable toolchain (0_19_1)	47s
Integration tests - stable toolchain (0_18_1)	1m 8s
Integration tests - stable toolchain (0_17_1)	1m 21s
Docs - nightly toolchain (recent)	1m 0s
Test - nightly toolchain (minimal)	44s
Lint - nightly toolchain (recent)	54s
Test - nightly toolchain (recent)	38s
	26m 30s

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