fix: download release SDK directly from Microsoft Blob

.gitea/workflows/publish-nuget.yml

@@ -5,6 +5,11 @@ on:
     tags:
       - 'v*'
   workflow_dispatch:
+    inputs:
+      release_tag:
+        description: Existing version tag to publish
+        required: false
+        type: string
 
 jobs:
   publish:
@@ -21,7 +26,7 @@ jobs:
     steps:
       - name: Fetch exact tagged source
         env:
-          GITEA_REF: ${{ gitea.ref }}
+          GITEA_REF: ${{ inputs.release_tag || gitea.ref }}
           GITEA_REPOSITORY: ${{ gitea.repository }}
         shell: bash
         run: |
@@ -63,7 +68,8 @@ jobs:
           const release = metadata.releases.find(item => item.sdk?.version === sdkVersion);
           const file = release?.sdk?.files?.find(item => item.rid === 'linux-x64' && item.name.endsWith('.tar.gz'));
           if (!file) throw new Error(`Linux x64 SDK archive not found for ${sdkVersion}`);
-          const archiveResponse = await fetch(file.url);
+          const archiveUrl = `https://dotnetcli.blob.core.windows.net/dotnet/Sdk/${sdkVersion}/dotnet-sdk-${sdkVersion}-linux-x64.tar.gz`;
+          const archiveResponse = await fetch(archiveUrl);
           if (!archiveResponse.ok) throw new Error(`SDK download failed: ${archiveResponse.status}`);
           await writeFile('/tmp/dotnet-sdk.tar.gz', new Uint8Array(await archiveResponse.arrayBuffer()));