Add GitHub Actions workflow and standalone script for building comprehensive OSVMarchi ISO images with native Arch Linux container plus FAR manager-style GitHub Pages site #6

Job	Run time
build-iso (amd64, amd64, x86-64, generic)	54s
build-iso (x86_64, generic-x86_64, x86-64, generic)	42s
build-iso (zen4, zen4-optimized, znver4, znver4)	53s
build-iso (epyc, epyc-optimized, znver2, znver2)	56s
build-iso (threadripper, threadripper-optimized, znver3, znver3)	56s
build-iso (zen5, zen5-optimized, znver5, znver5)	53s
	5m 14s

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