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 14 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #433185
docker-alpine x86_64
lint

00:00:17

 
  Build
passed #433190
docker-alpine ci-build aarch64
build-aarch64

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passed #433192
docker-alpine ci-build armhf
build-armhf

00:00:48

passed #433191
docker-alpine ci-build armv7
build-armv7

00:00:47

passed #433189
docker-alpine ci-build ppc64le
build-ppc64le

00:00:56

passed #433188
docker-alpine ci-build s390x
build-s390x

00:00:52

passed #433187
docker-alpine ci-build x86
build-x86

00:00:26

passed #433186
docker-alpine ci-build x86_64
build-x86_64

00:00:24