Add Dotnet 2.1, 3.1, 5.0 Docker Images (#9)

* Add Dotnet 2.1, 3.2, 5.0 Docker Images

dotnet/2.1/Dockerfile

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+FROM    ghcr.io/parkervcp/yolks:debian
+
+LABEL   author="Torsten Widmann" maintainer="info@goover.de"
+
+ENV     DEBIAN_FRONTEND noninteractive
+
+RUN     apt update -y \
+          && apt upgrade -y \
+          && apt install -y apt-transport-https wget iproute2 \
+          && wget https://packages.microsoft.com/config/debian/10/packages-microsoft-prod.deb -O packages-microsoft-prod.deb \
+          && dpkg -i packages-microsoft-prod.deb \
+          && rm packages-microsoft-prod.deb \
+          && apt update -y \
+          && apt install -y aspnetcore-runtime-2.1 libgdiplus
+
+USER    container
+ENV     USER=container HOME=/home/container
+WORKDIR /home/container
+
+COPY    ./../entrypoint.sh /entrypoint.sh
+CMD     ["/bin/bash", "/entrypoint.sh"]

dotnet/3.1/Dockerfile

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+FROM    ghcr.io/parkervcp/yolks:debian
+
+LABEL   author="Torsten Widmann" maintainer="info@goover.de"
+
+ENV     DEBIAN_FRONTEND noninteractive
+
+RUN     apt update -y \
+          && apt upgrade -y \
+          && apt install -y apt-transport-https wget iproute2 \
+          && wget https://packages.microsoft.com/config/debian/10/packages-microsoft-prod.deb -O packages-microsoft-prod.deb \
+          && dpkg -i packages-microsoft-prod.deb \
+          && rm packages-microsoft-prod.deb \
+          && apt update -y \
+          && apt install -y aspnetcore-runtime-3.1 libgdiplus
+
+USER    container
+ENV     USER=container HOME=/home/container
+WORKDIR /home/container
+
+COPY    ./../entrypoint.sh /entrypoint.sh
+CMD     ["/bin/bash", "/entrypoint.sh"]

dotnet/5/Dockerfile

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+FROM    ghcr.io/parkervcp/yolks:debian
+
+LABEL   author="Torsten Widmann" maintainer="info@goover.de"
+
+ENV     DEBIAN_FRONTEND noninteractive
+
+RUN     apt update -y \
+          && apt upgrade -y \
+          && apt install -y apt-transport-https wget iproute2 \
+          && wget https://packages.microsoft.com/config/debian/10/packages-microsoft-prod.deb -O packages-microsoft-prod.deb \
+          && dpkg -i packages-microsoft-prod.deb \
+          && rm packages-microsoft-prod.deb \
+          && apt update -y \
+          && apt install -y aspnetcore-runtime-5.0 libgdiplus
+
+USER    container
+ENV     USER=container HOME=/home/container
+WORKDIR /home/container
+
+COPY    ./../entrypoint.sh /entrypoint.sh
+CMD     ["/bin/bash", "/entrypoint.sh"]

dotnet/entrypoint.sh

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+#!/bin/bash
+cd /home/container
+
+# Make internal Docker IP address available to processes.
+export INTERNAL_IP=`ip route get 1 | awk '{print $NF;exit}'`
+
+# Replace Startup Variables
+MODIFIED_STARTUP=$(echo -e ${STARTUP} | sed -e 's/{{/${/g' -e 's/}}/}/g')
+echo -e ":/home/container$ ${MODIFIED_STARTUP}"
+
+# Run the Server
+eval ${MODIFIED_STARTUP}