drone docker image

BaseCompileImage/Dockerfile

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+FROM ubuntu:focal
+RUN export DEBIAN_FRONTEND=noninteractive \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+       wget \
+       ca-certificates \
+    \
+    # Install Microsoft package feed
+    && wget -q https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb \
+    && dpkg -i packages-microsoft-prod.deb \
+    && rm packages-microsoft-prod.deb \
+    \
+    # Install .NET
+    && apt-get update \
+    && apt-get install -y --no-install-recommends \
+	apt-transport-https \
+        dotnet-sdk-5.0 \
+        dotnet-sdk-3.1 \
+        libpng16-16 \
+	libnvtt-dev \
+    \
+    # Cleanup
+    && rm -rf /var/lib/apt/lists/*
+
+RUN dotnet tool install -g dotnet-mgcb