ci: release workflow

Author: blob42

.github/workflows/release.yml

@@ -30,8 +30,8 @@ jobs:
       shell: bash
       run: |
         ver=${GITHUB_REF##*/}
-        if [[ ! "$ver" =~ [0-9]+.[0-9]+.[0-9]+$ ]]; then
-          echo "Error: Tag format is invalid. Expected format: vX.X.X"
+        if [[ ! "$ver" =~ ^v[0-9]+(\.[0-9]+){2}(-rc[0-9]+)?$ ]]; then
+          echo "Error: Tag format is invalid. Expected format: vX.X.X or vX.X.X-rcX"
           exit 1
         fi