test

Added iconv extension to fix issues with newer symfony/polyfill-mbstr… #271

Job	Run time
build (Build static in Alpine, ubuntu-22.04, true, ./build-alpine, amd64, alpine)	7m 45s
build (Build static on amd64 OSX, macos-13, false, ./build-osx, amd64, osx)	11m 22s
build (Build static on arm64 OSX, macos-14, false, ./build-osx, arm64, osx)	6m 4s
build (Build dev version in Jammy, ubuntu-22.04, false, ./build-linux, amd64, jammy)	4m 14s
	29m 25s

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