feature: add .NET installation (#90)

* file: add .NET installation script dotnet.sh

* feat: add dotnet installation to custom image

* feat: add dotnet to build matrix

* Prepend `PATH` correctly

.github/workflows/build-ubuntu.yml

@@ -220,6 +220,7 @@ jobs:
           - js
           - pwsh
           - rust
+          - dotnet
           - custom
     steps:
       - name: Login to GitHub Container Registry

linux/ubuntu/scripts/custom.sh

@@ -39,6 +39,7 @@ scripts=(
   js
   rust
   vcpkg
+  dotnet
 )
 
 for SCRIPT in "${scripts[@]}"; do

linux/ubuntu/scripts/dotnet.sh

@@ -0,0 +1,31 @@
+#!/bin/bash -e
+################################################################################
+##  File:  dotnet.sh
+##  Desc:  Installs dotnet CLI
+##         Must be run as non-root user after homebrew
+################################################################################
+
+# Install dotnet CLI
+. /imagegeneration/installers/helpers/etc-environment.sh
+
+printf "\n\t🐋 Installing .NET 🐋\t\n"
+#apt-get install -y dotnet-sdk-7.0 dotnet-sdk-6.0 dotnet-runtime-7.0 dotnet-runtime-6.0
+curl -LO https://dotnet.microsoft.com/download/dotnet/scripts/v1/dotnet-install.sh
+cat ./dotnet-install.sh
+bash ./dotnet-install.sh --install-dir /opt/hostedtoolcache/dotnet --no-path --channel STS  # net 7.0
+bash ./dotnet-install.sh --install-dir /opt/hostedtoolcache/dotnet --no-path --channel LTS  # net 6.0
+rm ./dotnet-install.sh
+export DOTNET_ROOT=/opt/hostedtoolcache/dotnet
+export PATH=$PATH:$DOTNET_ROOT
+{
+  echo "DOTNET_ROOT=${DOTNET_ROOT}"
+} | tee -a /etc/environment
+
+prependEtcEnvironmentPath "${DOTNET_ROOT}"
+
+which dotnet
+dotnet --version
+dotnet --info
+#dotnet --list-sdks
+#dotnet --list-runtimes
+printf "\n\t🐋 Installed .NET 🐋\t\n"

linux/ubuntu/scripts/helpers/etc-environment.sh

@@ -26,7 +26,8 @@ function replaceEtcEnvironmentVariable {
     variable_value="$2"
 
     # modify /etc/environemnt in place by replacing a string that begins with variable_name
-    sudo sed -i -e "s%^${variable_name}=.*$%${variable_name}=\"${variable_value}\"%" /etc/environment
+    # removed quotes for the docker env metadata reader
+    sudo sed -i -e "s%^${variable_name}=.*$%${variable_name}=${variable_value}%" /etc/environment
 }
 
 function setEtcEnvironmentVariable {