voltctl: github-release.sh target failing

Problem likely due to docker image lacking a release directory.

+ cp 'release/*' ./release
cp: cannot stat 'release/*': No such file or directory

% ../github-release.sh
git has a SemVer released version tag: 'v1.8.3'
Building artifacts for GitHub release.
~/projects/sandbox/voltctl

Installed /usr/lib/go
-----------------------------------------------------------------------
/usr/lib/go-1.18

Go commands in $PATH
-----------------------------------------------------------------------
/usr/bin/go
/bin/go

VERSIONS:
-----------------------------------------------------------------------
git version 2.34.1
go version go1.18.1 linux/amd64

++ git log -1 --pretty=%B
++ tr -dc '[:alnum:]\n\r\.[]\:-\\/`\'\'' '
+ RELEASE_DESCRIPTION='VOL-4836 - Source edits to trigger a jenkins job.

Makefile
--------
 o Add copyright notice and common variables/includes.
 o Added a conditional variable to support local golang use w/o docker.

[snip]
Change-Id: Ifacba55c19f5391310ae247c36263c93e1249446'

+ make release
make: 'release' is up to date.
+ cp 'release/*' ./release
cp: cannot stat 'release/*': No such file or directory