testing/roswell: upgrade to 21.06.14.110

Also fixes sysconfdir and sets the musl variant for sbcl

Bug: https://github.com/roswell/roswell/issues/483
8 jobs for !22997 with testing/roswell-21.06.14.110 in 1 minute and 39 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #433193
docker-alpine x86_64
lint

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  Build
passed #433198
docker-alpine ci-build aarch64
build-aarch64

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passed #433200
docker-alpine ci-build armhf
build-armhf

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passed #433199
docker-alpine ci-build armv7
build-armv7

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passed #433197
docker-alpine ci-build ppc64le
build-ppc64le

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passed #433196
docker-alpine ci-build s390x
build-s390x

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passed #433195
docker-alpine ci-build x86
build-x86

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passed #433194
docker-alpine ci-build x86_64
build-x86_64

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