chore(build): release when tags matching version-[0-9]+.[0-9]+.[0-9]+… (#1039)

The jenkins jobs that publish/release spinnaker use tags of this form.  See e.g
https://github.com/spinnaker/buildtool/blob/d5ce1398e386c2ff92881310aba5a58f305b0241/dev/buildtool/spinnaker_commands.py#L295
+
https://github.com/spinnaker/buildtool/blob/d5ce1398e386c2ff92881310aba5a58f305b0241/dev/buildtool/spinnaker_commands.py#L305

Those jobs currently publish to bintray, but since that is going away, let's publish to nexus.

Author: dbyron-sf

.github/workflows/release.yml

@@ -5,6 +5,7 @@ on:
     tags:
     - "v[0-9]+.[0-9]+.[0-9]+"
     - "v[0-9]+.[0-9]+.[0-9]+-rc.[0-9]+"
+    - "version-[0-9]+.[0-9]+.[0-9]+"
 
 env:
   GRADLE_OPTS: -Dorg.gradle.daemon=false -Xmx2g -Xms2g