Use filter pattern instead of regex for tags filter in CI workflow (#3802)

since regex is not supported for filtering paths, tags and branches.

- Document: https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#filter-pattern-cheat-sheet
- Answer by GitHub staff: https://github.community/t/using-regex-for-filtering/16427/2

.github/workflows/main.yml

@@ -4,7 +4,8 @@ on:  # yamllint disable-line rule:truthy
   push:
     branches: [ master ]  # yamllint disable-line rule:brackets
     tags:
-      - /^v\d+\.\d+\.(x|\d+)$/
+      - v[0-9]+.[0-9]+.x
+      - v[0-9]+.[0-9]+.[0-9]+
   pull_request:
     branches: [ master ]  # yamllint disable-line rule:brackets