chore: parse matrix config directly

.github/workflows/dockerhub-release-matrix.yml

@@ -178,11 +178,13 @@ jobs:
         id: get_versions
         run: |
           nix run nixpkgs#nushell -- -c '
-            # Extract the versions from prepare.outputs.matrix_config
-            let versions = ${{ fromJson(needs.prepare.outputs.matrix_config).include }} | get version
-            echo "Versions: $versions"
+            # Parse the matrix configuration directly
+            let matrix_config = ${{ fromJson(needs.prepare.outputs.matrix_config) }}
+
+            # Extract the versions as a list
+            let versions = $matrix_config.include | get version
 
-            # Set the versions to an environment variable in GitHub Actions' environment
+            echo "Versions: $versions"
             let versions_str = ($versions | join ",")
             $"versions=$versions_str" | save --append $env.GITHUB_ENV
           '
@@ -199,6 +201,7 @@ jobs:
                 name: $artifact_name
             }
           '
+
       - name: Combine Results
         id: combine
         run: |