fix string substitution

Author: TrisNol

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Set env
         run: |
           echo "RELEASE_VERSION=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
-          if [${ env.RELEASE_VERSION } = "develop"]; then
+          if [${{ env.RELEASE_VERSION }} -eq "develop"]; then
             echo "PRERELEASE=true" >> $GITHUB_ENV
           else
             echo "PRERELEASE=false" >> $GITHUB_ENV