adding OpenPriv/flutter-desktop Dockerfiles for Linux and Windows

desktop/README.md

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+# Docker containers for performing Flutter desktop builds
+
+These docker containers are built on containers from [cirrusci](https://hub.docker.com/u/cirrusci) ([cirruslabs](https://github.com/cirruslabs)).
+
+- linux-dev is just cirrusci/flutter:dev + apt installing the needed utils
+- windows-dev-sdk30-fdev2.2rc is cirrusci/android-sdk:30-windowsservercore-2019 with Visual Studio 16, and Flutter dev (2.2rc)
+
+These docker containers are both being used with Drone CI to build Flutter desktop apps for Linux and Windows. Simply run `flutter build` with the appropriate OS. These containers should work with any other Docker based automated build system such as Gitlab and others.
+
+Example [.drone.yml](https://git.openprivacy.ca/flutter/flutter_app/src/branch/trunk/.drone.yml)

desktop/linux/Dockerfile

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+FROM cirrusci/flutter:dev
+
+RUN apt-get update
+RUN apt-get install -y --no-install-recommends cmake ninja-build clang build-essential pkg-config libgtk-3-dev liblzma-dev lcov
+RUN flutter config --enable-linux-desktop

desktop/windows/Dockerfile

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+FROM cirrusci/android-sdk:30-windowsservercore-2019
+
+# Install VS
+## https://docs.microsoft.com/en-us/visualstudio/install/build-tools-container?view=vs-2019
+
+## Restore the default Windows shell for correct batch processing.
+SHELL ["cmd", "/S", "/C"]
+
+## Download the Build Tools bootstrapper.
+ADD https://aka.ms/vs/16/release/channel C:/TEMP/VisualStudio.chman
+
+ADD https://aka.ms/vs/16/release/vs_buildtools.exe C:/TEMP/vs_buildtools.exe
+## https://docs.microsoft.com/en-us/visualstudio/install/workload-component-id-vs-build-tools?view=vs-2019
+RUN C:\TEMP\vs_buildtools.exe --quiet --wait --norestart --nocache \
+    --channelUri C:\TEMP\VisualStudio.chman \
+    --installChannelUri C:\TEMP\VisualStudio.chman \
+    --add Microsoft.VisualStudio.Component.Windows10SDK.19041 \
+    --add Microsoft.VisualStudio.Component.VC.Tools.x86.x64 \
+    --add Microsoft.VisualStudio.Component.VC.CMake.Project \
+    --add Microsoft.VisualStudio.Workload.NativeDesktop \
+    --add Microsoft.VisualStudio.Workload.ManagedDesktopBuildTools \
+    --add Microsoft.VisualStudio.Workload.VCTools \
+    --add Microsoft.VisualStudio.Component.VC.CLI.Support \
+    --installPath C:\BuildTools \
+     || IF "%ERRORLEVEL%"=="3010" EXIT 0
+
+# Install Flutter
+
+RUN setx path "%path%;C:\flutter\bin;C:\flutter\bin\cache\dart-sdk\bin;"
+
+RUN git clone --branch dev https://github.com/flutter/flutter.git C:\flutter
+
+RUN flutter config --no-analytics
+
+RUN flutter config --enable-windows-desktop
+
+## Fix android sdk licenses (missing in cirruslabs container)
+RUN powershell.exe -Command \
+        Set-Content -Value "`n859f317696f67ef3d7f30a50a5560e7834b43903" -Path C:\Android\licenses\android-sdk-arm-dbt-license
+
+RUN flutter doctor -v