feat(devcontainer): add gtkwave (#6)

Author: rishabhrkaushik

.devcontainer/Dockerfile

@@ -6,7 +6,7 @@ ENV PDK_ROOT=/home/vscode/ttsetup/pdk
 ENV PDK=sky130A
 
 RUN apt update
-RUN apt install -y iverilog python3 python3-pip python3-venv python3-tk python-is-python3 libcairo2 verilator libpng-dev libqhull-dev
+RUN apt install -y iverilog gtkwave python3 python3-pip python3-venv python3-tk python-is-python3 libcairo2 verilator libpng-dev libqhull-dev
 
 # Clone tt-support-tools
 RUN mkdir -p /ttsetup