another fix attempt

.github/workflows/publish_docker_matrix.yml

@@ -28,7 +28,7 @@ jobs:
           workflows=$(find .github/workflows -name 'publish_docker_matrix_*.yml' -exec basename {} \;)
           echo "Found workflows: $workflows"
           # Convert to JSON array
-          matrix_json=$(echo "$workflows" | tr ' ' '\n' | sed -e 's/^/"/' -e 's/$/"/' -e 's/\n/","/g' -e 's/","$//' -e 's/^/[/;s/$/]/')
+          matrix_json=$(echo "$workflows" | tr ' ' '\n' | sed 's/^/"/;s/$/"/' | paste -sd, - | sed 's/^/[ /;s/$/ ]/')
           echo "matrix_json=$matrix_json" >> $GITHUB_ENV
 
       - name: Trigger Workflows