Added github CLI install to Dockefile

Dockerfile

@@ -2,7 +2,12 @@
 FROM ubuntu:latest
 
 # Update the package list and install dependencies
-RUN apt update && apt install -y python3 python3-pip git
+RUN apt update && apt install -y python3 python3-pip git curl gpg
+
+# Install github CLI
+RUN curl -fsSL https://cli.github.com/packages/githubcli-archive-keyring.gpg | gpg --dearmor -o /usr/share/keyrings/githubcli-archive-keyring.gpg
+RUN echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/githubcli-archive-keyring.gpg] https://cli.github.com/packages stable main" | tee /etc/apt/sources.list.d/github-cli.list > /dev/null
+RUN apt update && apt install -y gh
 
 RUN git clone https://github.com/csc510-team5/GITS2.1-I.R.I.S.git /app
 RUN ln -s /app/code /root/code # necessary for gits list