fixed var reference

Author: Petr Sramek

.github/workflows/dotnet.yml

@@ -41,7 +41,7 @@ jobs:
       ASSEMBLY_VERSION: ${{ steps.gitversion.outputs.assemblySemVer }}.${{ github.run_number }}
       ASSEMBLY_INFORMATIONAL_VERSION: ${{ steps.gitversion.outputs.assemblySemVer }}.${{ github.run_number }}+${{ steps.gitversion.outputs.sha }}
       FILE_VERSION: ${{ steps.gitversion.outputs.assemblySemVer }}.${{ github.run_number }}
-      PACKAGE_VERSION: ${{ fromJSON(format('[ "{0}{1}", "{0}" ]', steps.gitversion.outputs.assemblySemVer, steps.gitversion.outputs.preReleaseLabelWithDash))[fromJSON(inputs.is-release)] }}
+      PACKAGE_VERSION: ${{ fromJSON(format('[ "{0}{1}", "{0}" ]', steps.gitversion.outputs.assemblySemVer, steps.gitversion.outputs.preReleaseLabelWithDash))[fromJSON(env.is-release)] }}
 
     steps:
       - uses: actions/checkout@v4