Use env var for step output in release workflow

Author: charlesvien

.github/workflows/code-release.yml

@@ -127,4 +127,5 @@ jobs:
       - name: Publish GitHub release
         env:
           GH_TOKEN: ${{ steps.app-token.outputs.token }}
-        run: gh release edit "v${{ steps.version.outputs.version }}" --repo PostHog/code --draft=false
+          APP_VERSION: ${{ steps.version.outputs.version }}
+        run: gh release edit "v$APP_VERSION" --repo PostHog/code --draft=false