Added nuget build for runtime-ubuntu-20.04-x64

.github/workflows/ubuntu20.yml

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+name: Ubuntu 20.04
+
+on:
+  pull_request:
+    types: [synchronize, opened]
+  push:
+    branches:
+      - master
+
+env:
+  DEBIAN_FRONTEND: noninteractive
+  OPENCV_VERSION: 4.6.0
+
+jobs:
+  build:
+
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 1
+
+      - name: Install dependencies
+        run: |
+          pwd
+          echo ${GITHUB_WORKSPACE}
+          current_path=$(pwd)
+          sudo apt-get update -y 
+          sudo apt-get install -y  --no-install-recommends \
+            apt-transport-https \
+            software-properties-common \
+            wget \
+            unzip \
+            ca-certificates \
+            build-essential \
+            cmake \
+            git \
+            libtbb-dev \
+            libatlas-base-dev \
+            libgtk2.0-dev \
+            libavcodec-dev \
+            libavformat-dev \
+            libswscale-dev \
+            libdc1394-22-dev \
+            libxine2-dev \
+            libv4l-dev \
+            libtheora-dev \
+            libvorbis-dev \
+            libxvidcore-dev \
+            libopencore-amrnb-dev \
+            libopencore-amrwb-dev \
+            libavresample-dev \
+            x264 \
+            libtesseract-dev 
+
+      - name: Cache OpenCV
+        id: opencv-cache
+        uses: actions/cache@v2
+        with:
+          path: ${{ github.workspace }}/opencv_ubuntu/
+          key: opencv-${{ env.OPENCV_VERSION }}-rev1
+
+      - name: Build OpenCV
+        if: steps.opencv-cache.outputs.cache-hit != 'true'
+        run: |
+          wget https://github.com/opencv/opencv/archive/${OPENCV_VERSION}.zip -Oopencv-${OPENCV_VERSION}.zip && unzip opencv-${OPENCV_VERSION}.zip
+          wget https://github.com/opencv/opencv_contrib/archive/${OPENCV_VERSION}.zip -Oopencv_contrib-${OPENCV_VERSION}.zip && unzip opencv_contrib-${OPENCV_VERSION}.zip
+          cd opencv-${OPENCV_VERSION} && mkdir build && cd build
+          cmake \
+            -D CMAKE_BUILD_TYPE=Release \
+            -D OPENCV_EXTRA_MODULES_PATH=../../opencv_contrib-${OPENCV_VERSION}/modules \
+            -D BUILD_SHARED_LIBS=OFF \
+            -D ENABLE_CXX11=ON \
+            -D BUILD_EXAMPLES=OFF \
+            -D BUILD_DOCS=OFF \
+            -D BUILD_PERF_TESTS=OFF \
+            -D BUILD_TESTS=OFF \
+            -D BUILD_JAVA=OFF \
+            -D BUILD_opencv_apps=OFF \
+            -D BUILD_opencv_barcode=OFF \
+            -D BUILD_opencv_java_bindings_generator=OFF \
+            -D BUILD_opencv_python_bindings_generator=OFF \
+            -D BUILD_opencv_python_tests=OFF \
+            -D BUILD_opencv_ts=OFF \
+            -D BUILD_opencv_js=OFF \
+            -D BUILD_opencv_js_bindings_generator=OFF \
+            -D BUILD_opencv_bioinspired=OFF \
+            -D BUILD_opencv_ccalib=OFF \
+            -D BUILD_opencv_datasets=OFF \
+            -D BUILD_opencv_dnn_objdetect=OFF \
+            -D BUILD_opencv_dpm=OFF \
+            -D BUILD_opencv_fuzzy=OFF \
+            -D BUILD_opencv_gapi=ON \
+            -D BUILD_opencv_intensity_transform=OFF \
+            -D BUILD_opencv_mcc=OFF \
+            -D BUILD_opencv_objc_bindings_generator=OFF \
+            -D BUILD_opencv_rapid=OFF \
+            -D BUILD_opencv_reg=OFF \
+            -D BUILD_opencv_stereo=OFF \
+            -D BUILD_opencv_structured_light=OFF \
+            -D BUILD_opencv_surface_matching=OFF \
+            -D BUILD_opencv_wechat_qrcode=ON \
+            -D BUILD_opencv_videostab=OFF \
+            -D WITH_GSTREAMER=OFF \
+            -D WITH_ADE=OFF \
+            -D OPENCV_ENABLE_NONFREE=ON \
+            -D CMAKE_INSTALL_PREFIX=${GITHUB_WORKSPACE}/opencv_ubuntu ..
+          make -j2
+          make install
+          sudo ldconfig
+          cd ${GITHUB_WORKSPACE}
+          ls
+
+      - name: Build OpenCvSharpExtern
+        run: |                    
+          ls ${GITHUB_WORKSPACE}/opencv_ubuntu
+          echo "-----"
+          ls ${GITHUB_WORKSPACE}/opencv_ubuntu/lib
+          echo "-----"
+          mkdir src/build && cd $_
+          cmake -D CMAKE_PREFIX_PATH=${GITHUB_WORKSPACE}/opencv_ubuntu ..
+          make -j2
+          ls OpenCvSharpExtern
+          cp OpenCvSharpExtern/libOpenCvSharpExtern.so ${GITHUB_WORKSPACE}/nuget/
+          ldd OpenCvSharpExtern/libOpenCvSharpExtern.so
+
+      - name: Check OpenCvSharpExtern
+        run: |
+          cd ${GITHUB_WORKSPACE}/nuget/
+          ldd libOpenCvSharpExtern.so
+          nm libOpenCvSharpExtern.so
+          echo -ne "#include <stdio.h> \n int core_Mat_sizeof(); int main(){ int i = core_Mat_sizeof(); printf(\"sizeof(Mat) = %d\", i); return 0; }" > test.c
+          gcc -I./ -L./ test.c -o test -lOpenCvSharpExtern
+          LD_LIBRARY_PATH=. ./test
+
+      - name: Install .NET
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: '6.0.x'
+
+      - name: Create NuGet package
+        env: 
+          BETA: ""
+        run: |
+          yyyymmdd=`date '+%Y%m%d'`
+          echo $yyyymmdd
+          sed -E --in-place=.bak "s/<version>[0-9]\.[0-9]{1,2}\.[0-9]{1,2}.[0-9]{8}(-beta[0-9]*)?<\/version>/<version>${OPENCV_VERSION}.${yyyymmdd}${BETA}<\/version>/" ${GITHUB_WORKSPACE}/nuget/OpenCvSharp4.runtime.ubuntu.20.04-x64.nuspec
+          cat ${GITHUB_WORKSPACE}/nuget/OpenCvSharp4.runtime.ubuntu.20.04-x64.nuspec
+          dotnet pack ${GITHUB_WORKSPACE}/nuget/OpenCvSharp4.runtime.ubuntu.20.04-x64.csproj -o ${GITHUB_WORKSPACE}/artifacts_ubuntu
+          ls ${GITHUB_WORKSPACE}/artifacts_ubuntu
+
+      - uses: actions/upload-artifact@v1
+        with:
+          name: artifacts_ubuntu_20
+          path: artifacts_ubuntu
+
+      - name: Test
+        run: |
+          cd ${GITHUB_WORKSPACE}/test/OpenCvSharp.Tests
+          dotnet build -c Release -f net6.0
+          cp ${GITHUB_WORKSPACE}/nuget/libOpenCvSharpExtern.so ${GITHUB_WORKSPACE}/test/OpenCvSharp.Tests/bin/Release/net6.0/
+          cp ${GITHUB_WORKSPACE}/nuget/libOpenCvSharpExtern.so ${GITHUB_WORKSPACE}/test/OpenCvSharp.Tests/
+          sudo cp ${GITHUB_WORKSPACE}/nuget/libOpenCvSharpExtern.so /usr/lib/
+          # ls ${GITHUB_WORKSPACE}/test/OpenCvSharp.Tests/bin/Release/net6.0/
+          # ls
+          LD_LIBRARY_PATH=. dotnet test OpenCvSharp.Tests.csproj -c Release -f net6.0 --runtime ubuntu.20.04-x64 --logger "trx;LogFileName=test-results.trx" < /dev/null
+          # ls
+          # ls TestResults

nuget/OpenCvSharp4.runtime.ubuntu.20.04-x64.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFrameworks>netstandard2.0;netstandard2.1;netcoreapp2.1;</TargetFrameworks>
+    <NoBuild>true</NoBuild>
+    <IncludeBuildOutput>false</IncludeBuildOutput>
+    <NuspecFile>OpenCvSharp4.runtime.ubuntu.20.04-x64.nuspec</NuspecFile>
+    <NuspecProperties></NuspecProperties>
+    <NuspecBasePath></NuspecBasePath>
+    <!--<IncludeSymbols>true</IncludeSymbols>
+    <SymbolPackageFormat>snupkg</SymbolPackageFormat>-->
+  </PropertyGroup>
+</Project>

nuget/OpenCvSharp4.runtime.ubuntu.20.04-x64.nuspec

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
+    <metadata>
+        <id>OpenCvSharp4.runtime.ubuntu.20.04-x64</id>
+        <version>4.6.0.20220608</version>
+        <title>OpenCvSharp native bindings for ubuntu.20.04-x64</title>
+        <authors>shimat</authors>
+        <license type="expression">Apache-2.0</license>
+        <!--<licenseUrl>https://opensource.org/licenses/BSD-3-Clause</licenseUrl>-->
+        <projectUrl>https://github.com/shimat/opencvsharp</projectUrl>
+        <iconUrl>https://raw.githubusercontent.com/shimat/opencvsharp/master/nuget/icon/opencvsharp.png</iconUrl>
+        <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <description>Internal implementation package for OpenCvSharp to work on Ubuntu 20.04</description>
+        <summary>Internal implementation package for OpenCvSharp to work on Ubuntu 20.04</summary>
+        <releaseNotes></releaseNotes>
+        <copyright>Copyright 2008-2019</copyright>
+        <tags>Image Processing OpenCV Wrapper FFI opencvsharp</tags>
+        <repository type="git" url="https://github.com/shimat/opencvsharp.git" />
+        <dependencies>
+            <group targetFramework="netstandard2.0"></group>
+            <group targetFramework="netstandard2.1"></group>
+            <group targetFramework="netcoreapp3.1"></group>
+        </dependencies>
+        <frameworkAssemblies>
+        </frameworkAssemblies>
+    </metadata>
+    <files>
+        <file src="libOpenCvSharpExtern.so" target="runtimes/ubuntu.20.04-x64/native" />
+    </files>
+</package>