feat: add publish workflow

Signed-off-by: Shiwei Zhang <[email protected]>

.github/workflows/release-nuget.yml

@@ -0,0 +1,37 @@
+# Copyright The ORAS Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: release-nuget
+
+on:
+  push:
+    tags:
+      - v*
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up dotnet environment
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '8.0.x'
+      - name: Extract Version
+        id: version
+        run: echo "version=${GITHUB_REF_NAME#v}" >> $GITHUB_OUTPUT
+      - name: Build nuget package
+        run: dotnet build ./src/OrasProject.Oras --configuration Release /p:PackageVersion=${{ steps.version.outputs.version }}
+      - name: Publish nuget package
+        run: dotnet nuget push ./src/OrasProject.Oras/bin/Release/OrasProject.Oras.${{ steps.version.outputs.version }}.nupkg --source https://api.nuget.org/v3/index.json --api-key ${{ secrets.NUGET_API_KEY }}