Update CI workflow and packaging script to handle empty NuGet output …

…files and adjust CI_TAG assignment

- Modify CI workflow to set CI_TAG to "vTEST" if github.ref_name is not defined.
- Change condition for creating NuGet package to check for 'musl' in matrix.target.
- Enhance pack.sh script to verify that the NuGet output file is not empty, exiting with an error if it is.

.github/workflows/ci.yml

@@ -375,18 +375,18 @@ jobs:
         shell: bash
         run: ./ci/pack_nuget/pack.sh tool
         env:
-          CI_TAG: ${{ github.ref_name }}
+          CI_TAG: ${{ github.ref_name || "vTEST" }}
           PACKAGE_SUFFIX: ${{ matrix.suffix }}
           NUGET_RUNTIME: ${{ matrix.nuget-rid }}
           REPO_NAME: ${{ env.GITHUB_REPOSITORY_OWNER }}\/${{ env.GITHUB_REPOSITORY_NAME }}
           BINARIES_DIR: "${{ env.REL_BINARIES_DIR }}"
 
       - name: "Create NuGet Package Imageflow.NativeRuntime.${{ matrix.nuget-rid }}"
-        if: ${{ matrix.build-exclude != 'imageflow_abi' }}
+        if: ${{ contains(matrix.target, 'musl') }}
         shell: bash
         run: ./ci/pack_nuget/pack.sh
         env:
-          CI_TAG: ${{ github.ref_name }}
+          CI_TAG: ${{ github.ref_name || "vTEST" }}
           PACKAGE_SUFFIX: ${{ matrix.suffix }}
           NUGET_RUNTIME: ${{ matrix.nuget-rid }}
           REPO_NAME: ${{ env.GITHUB_REPOSITORY_OWNER }}\/${{ env.GITHUB_REPOSITORY_NAME }}

ci/pack_nuget/pack.sh

@@ -155,6 +155,13 @@ mkdir -p "$STAGING_DIR" || true
 
     rm "${NUGET_OUTPUT_FILE}" || true
     zip -r "${NUGET_OUTPUT_FILE}" . || 7z a -tzip "${NUGET_OUTPUT_FILE}" "*" || powershell.exe -ExecutionPolicy Bypass -File "${SCRIPT_DIR}/zip.ps1" "${NUGET_OUTPUT_FILE}" "*"
+
+    # verify file is not empty
+    if [[ ! -s "${NUGET_OUTPUT_FILE}" ]]; then
+        echo "Error: ${NUGET_OUTPUT_FILE} is empty"
+        exit 1
+    fi
+
     echo  "${NUGET_OUTPUT_FILE} packed"
 
 )