Update trigger-release.yml

Author: thomasleplus

.github/workflows/trigger-release.yml

@@ -22,7 +22,7 @@ jobs:
         if: github.ref == 'refs/heads/main'
         run: |
           # shellcheck disable=SC2086
-          VERSION="$(\grep ${IMAGE}/Dockerfile -e '^FROM' | \head -n 1 | \sed -e 's/(-[A-Za-z0-9]+)?@.*$//; s/^.*://;')"
+          VERSION="$(\grep ${IMAGE}/Dockerfile -e '^FROM' | \head -n 1 | \sed -e 's/(-[A-Za-z][A-Za-z0-9]*)?@.*$//; s/^.*://;')"
           if [[ "${VERSION}" =~ ^[0-9]+\.[0-9]+$ ]] ; then
             \echo "VERSION=${VERSION}" >> "${GITHUB_ENV}"
           fi