Create cpp20 build
diff --git a/.github/workflows/log4cxx-cpp20.yml b/.github/workflows/log4cxx-cpp20.yml
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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: log4cxx-cpp20
+
+on: [push, pull_request]
+
+jobs:
+  job:
+    name: log4cxx-cpp20
+    runs-on: ubuntu-22.04
+    timeout-minutes: 38
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        path: main
+
+    - name: 'Configure Dependencies - Ubuntu'
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y libapr1-dev libaprutil1-dev libboost-filesystem-dev libboost-thread-dev libesmtp-dev
+
+    - name: 'run cmake - *nix'
+      run: |
+        cd main
+        mkdir build
+        cd build
+        cmake -DCMAKE_CXX_STANDARD=20 -DLOG4CXX_ENABLE_ESMTP=ON ..
+        cmake --build .
+
+    - name: run unit tests
+      shell: pwsh
+      run: |
+        cd main
+        cd build
+        ctest -C Debug --output-on-failure -V
+