Ensure --prerelease flag is passed to gh create release for pre-releases (#3004)

This changes our script to be explicit and pass the `--prerelease`
version
to our increasingly automated release pipeline when the `-` character is
detected in the "version" property of the release being published.

Typically, GitHub marks "latest" versions "based on semver"[1], but
GitHub
still marks "pre-release versions" (as defined by Semver 2.0 [2]) as
"latest" irregardless of that meaning to semver.

This seems a bit unexpected, but it is the way it is, so we'll account
for
it by making sure we're explicit.

[1]:
https://docs.github.com/en/repositories/releasing-projects-on-github/managing-releases-in-a-repository#:~:text=the%20latest%20release%20label%20will%20automatically%20be%20assigned%20based%20on%20semantic%20versioning
[2]: https://semver.org/#spec-item-9

Follows-up: #3003 (root-cause)

---------

Co-authored-by: Jeremy Lempereur <[email protected]>

Author: abernix

.circleci/config.yml

@@ -649,8 +649,19 @@ jobs:
           command: >
             cd artifacts && sha1sum *.tar.gz > sha1sums.txt
       - run:
+          name: Create GitHub Release
           command: >
-            gh release create $VERSION --notes-file /dev/null --title $VERSION artifacts/*
+            case "$VERSION" in
+
+              # If the VERSION contains a dash, consider it a pre-release version.
+              # This is in-line with SemVer's expectations/designations!
+              *-*) gh release create $VERSION --prerelease --notes-file /dev/null --title $VERSION artifacts/* ;;
+
+              # In all other cases, publish it as the latest version.
+              *) gh release create $VERSION --notes-file /dev/null --title $VERSION artifacts/* ;;
+
+            esac
+
       - setup_remote_docker:
           version: 20.10.11
           docker_layer_caching: true