chore: fix build_release.yml (#867)

.github/workflows/build_release.yml

@@ -21,18 +21,18 @@ jobs:
         run: |
           prev_tag=$(git describe --tags --abbrev=0 2>/dev/null || echo "none")
 
+          echo "Previous tag: $prev_tag"
+          echo "previous_tag=$prev_tag" >> $GITHUB_ENV
+          
           if [ "$prev_tag" == "none" ]; then
             echo "No tags found. Setting changed=true by default."
             echo "changed=true" >> $GITHUB_ENV
-          else
-            echo "Previous tag: $prev_tag"
-            echo "previous_tag=$prev_tag" >> $GITHUB_ENV
           fi
 
       - name: Check for changes between previous tag and latest commit in src directory
         id: changes
         run: |
-          if [ "$prev_tag" != "none" ]; then
+          if [ "${{ env.previous_tag }}" != "none" ]; then
             if git diff --exit-code ${{ env.previous_tag }} HEAD -- src; then
               echo "No changes detected in 'src' directory between ${{ env.previous_tag }} and the latest commit."
               echo "changed=false" >> $GITHUB_ENV