build

CI: use clean containers for linux and windows builds #1649

Job	Run time
headless	12m 53s
linux (aarch64)	17s
linux-x86_64-debug	12m 50s
linux (armhf)	13s
lto	12m 48s
linux (i386)	17s
macos (universal-10.15)	12m 54s
linux (riscv64)	13s
modaudio (modduo, modduo-static, MODDUO=true)	13m 1s
linux (x86_64)	16s
plugin-validation	12m 56s
source-tarball	12m 32s
modaudio (modduox, modduox-static)	12m 59s
modaudio (moddwarf, moddwarf)	12m 54s
sysdeps	12m 52s
wasm (simd)	12m 44s
windows (win32)	1s
wasm (nosimd)	12m 43s
windows (win64)	14s
	2h 35m 37s

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