ci: add submodules status workflow #665

Job	Run time
quakespasm - Linux Clang	49s
quakespasm - Linux GCC	54s
quakespasm - macOS Intel	50s
quakespasm - macOS ARM	28s
quakespasm - MSVC 32-bit	1m 26s
quakespasm - MSVC 64-bit	1m 26s
quakespasm-spiked - Linux Clang	2m 53s
quakespasm-spiked - Linux GCC	59s
quakespasm-spiked - macOS Intel	59s
quakespasm-spiked - macOS ARM	44s
quakespasm-spiked - MSVC 32-bit	1m 29s
quakespasm-spiked - MSVC 64-bit	1m 27s
vkquake - Linux Clang	2m 7s
vkquake - Linux GCC	1m 11s
vkquake - macOS Intel	1m 38s
vkquake - macOS ARM	37s
vkquake - MSVC 32-bit	1m 54s
vkquake - MSVC 64-bit	1m 53s
ironwail - Linux Clang	1m 8s
ironwail - Linux GCC	1m 9s
ironwail - macOS Intel	47s
ironwail - macOS ARM	30s
ironwail - MSVC 32-bit	1m 37s
ironwail - MSVC 64-bit	3m 6s
	32m 1s

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