FROM alpine:3.7
RUN apk --no-cache add foo

FROM alpine:3.7
RUN apk --no-cache add foo=~1.2.3

FROM alpine:3.7
RUN apk --no-cache add foo=1.2.3

Note: Pinning exact versions can cause future builds to suddenly fail if that version is no longer available. Use with caution.

Available versions in apk can search on https://pkgs.alpinelinux.org

https://docs.docker.com/develop/develop-images/instructions/#run

Version pinning forces the build to retrieve a limited range of versions, or an exact particular version, regardless of what’s in the cache. This technique can also reduce failures due to unanticipated changes in required packages.