Squashed commit of the following:

commit 3d8f4af
Author: Junjie Gao <junjiegao@microsoft.com>
Date:   Tue Dec 26 08:21:22 2023 +0800

    build: bump up donet 8 (#145)

    Bump up:
    - dotnet 8
    - dependencies

    Fix:
    - unit test warnings

    Signed-off-by: Junjie Gao <junjiegao@microsoft.com>

    ---------

    Signed-off-by: Junjie Gao <junjiegao@microsoft.com>

Signed-off-by: Junjie Gao <junjiegao@microsoft.com>

.github/workflows/test.yml

@@ -117,11 +117,13 @@ jobs:
     name: E2E testing on Linux
     runs-on: ubuntu-latest
     container:
-      image: mcr.microsoft.com/cbl-mariner/busybox:2.0
+      image: mcr.microsoft.com/cbl-mariner/base/core:2.0
       options: --cpus 1
     needs: test
     if: github.event.pull_request.head.repo.full_name == github.repository || github.event_name == 'push'
     steps:
+      - name: Install tar
+        run: yum install tar -y
       - name: Check out code into the project directory
         uses: actions/checkout@v3
       - uses: actions/download-artifact@v3