ci: release workflow should run only for semver tags and avoid early-access ones (#111)

Signed-off-by: Tomer Figenblat <tfigenbl@redhat.com>

Author: TomerFi

.github/workflows/release.yml

@@ -2,7 +2,7 @@ name: Generate changelog and plugin archive for new release
 on:
   push:
     tags:
-      - '*'
+      - "[0-9]+.[0-9]+.[0-9]+"
 jobs:
   build:
     runs-on: ubuntu-latest