updating Dockerfile

Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:focal
+FROM ubuntu:22.04
 
 # update apt-get
 RUN apt-get -y update
@@ -16,7 +16,7 @@ VOLUME /devvol
 RUN apt-get -y update
 
 # install dependencies
-RUN apt-get install -y apt-transport-https build-essential libgconf-2-4 python git libglib2.0-dev
+RUN apt-get install -y apt-transport-https build-essential libgconf-2-4 python3 git libglib2.0-dev
 
 # install node
 
@@ -25,7 +25,7 @@ RUN sudo apt-get install -y nodejs
 
 # install net core
 
-RUN wget https://packages.microsoft.com/config/ubuntu/20.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
+RUN wget https://packages.microsoft.com/config/ubuntu/22.04/packages-microsoft-prod.deb -O packages-microsoft-prod.deb
 RUN sudo dpkg -i packages-microsoft-prod.deb
 RUN sudo apt-get update
 RUN sudo apt-get install -y dotnet-sdk-8.0