ERROR: unsatisfiable constraints: 468 | mysql-client (missing):

We started receiving error like this when building our containers using gliderlabs alpine image. anyone else having this issue? seems like the repo is offline.

Step 19/20 : RUN apk-install mysql-client
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460 | ---> Running in 904ed846317e
461 | fetch http://alpine.gliderlabs.com/alpine/v3.7/main/x86_64/APKINDEX.tar.gz
462 | ERROR: http://alpine.gliderlabs.com/alpine/v3.7/main: temporary error (try again later)
463 | WARNING: Ignoring APKINDEX.fdc08959.tar.gz: No such file or directory
464 | fetch http://alpine.gliderlabs.com/alpine/v3.7/community/x86_64/APKINDEX.tar.gz
465 | ERROR: http://alpine.gliderlabs.com/alpine/v3.7/community: temporary error (try again later)
466 | WARNING: Ignoring APKINDEX.8400eac4.tar.gz: No such file or directory
467 | ERROR: unsatisfiable constraints:
468 | mysql-client (missing):
469 | required by: world[mysql-client]
470 | The command '/bin/sh -c apk-install mysql-client' returned a non-zero code: 1