Experimental build workflow

.github/workflows/build.yaml

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+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to you 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: build
+
+on:
+  workflow_dispatch:
+
+jobs:
+
+  build:
+
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ macos-latest, ubuntu-latest, windows-latest ]
+
+    steps:
+
+      - name: Checkout repository
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332   # 4.1.7
+
+      - name: Set up dotnet
+        uses: actions/setup-dotnet@6bd8b7f7774af54e05809fcc5431931b3eb1ddee   # 4.0.1
+        with:
+          dotnet-version: 8
+          dotnet-quality: ga
+
+      - name: Build
+        run: |
+          dotnet restore src/log4net.sln
+          dotnet build src/log4net.sln
+
+      - name: Test
+        run: dotnet test src/log4net.sln