When the tag is `v1.2.3`, name the artifacts `zstd-1.2.3.tar*` rather than `zstd-v1.2.3.tar*`. When the tag doesn't match, use the full tag.
When the tag is `v1.2.3`, name the artifacts `zstd-1.2.3.tar*` rather than `zstd-v1.2.3.tar*`. When the tag doesn't match, use the full tag.