chore(ci): add snos-release.yml placeholder file

Recently gh cli is blocking the execution of workflows
that are not on the default branch.
To go around this limitation, having the workflow file
with the same name (but not same content) on the default
branch helps going over this limitation.

Author: glihm

.github/workflows/snos-release.yml

@@ -0,0 +1,8 @@
+# Due to workflow limitation of github, this file is merely here
+# to support triggering the workflow on a dev branch, without having
+# to merge it into main.
+#
+# gh workflow run snos-release.yml --ref feat/update-gen-and-statefull-compr -f preview=v1.7.0-snos.1
+#
+# This can be deleted once the development branch is merged back to main.
+#