fix variable parsing

Author: juliodialpad

.github/workflows/deploy.yml

@@ -79,6 +79,8 @@ jobs:
 
   get-branch-name:
     runs-on: ubuntu-latest
+    outputs:
+      current_branch: ${{ steps.branch-name.outputs.current_branch }}
     steps:
     - name: Get branch name
       id: branch-name
@@ -114,7 +116,7 @@ jobs:
     concurrency: ${{ github.workflow }}-${{ github.ref }}
     runs-on: ubuntu-latest
     env:
-      VUEPRESS_BASE_URL: ${{ fromJSON('[/${{ needs.get-branch-name.branch-name.outputs.current_branch }}/, "/"]')[github.ref == 'refs/heads/production'] }}
+      VUEPRESS_BASE_URL: ${{ fromJSON('[format("/${0}/", needs.get-branch-name.outputs.current_branch), "/"]')[github.ref == 'refs/heads/production'] }}
     steps:
       - name: Checkout
         uses: actions/checkout@v4