debian: enable Salsa Continuous Integration testing #122

Job	Run time
Build and test with ASAN enabled	1m 37s
Build and test with clang	1m 17s
Build and test with gcc	57s
Cross-compile for Android (aarch64)	41s
Build and test with gcc -m32	1m 15s
Cross-compile for Android (armv7a)	36s
Build and test on macOS	1m 30s
Build and test with UBSAN enabled	1m 26s
Cross-compile for Android (i686)	32s
Cross-compile for Android (x86_64)	32s
Build mke2fs on Windows with mingw32	2m 54s
Build mke2fs on Windows with mingw64	11m 10s
	24m 27s

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