fix: dart as dependency only

Dockerfile

@@ -13,15 +13,7 @@ RUN npm install
 RUN apt-get update
 # Install git
 RUN apt-get -y install git
-# Install wget
-RUN apt-get install -y wget 
-# Install gpg-agent
-RUN apt-get install gpg-agent
 # Install dart
-RUN apt-get install apt-transport-https
-RUN wget -qO- https://dl-ssl.google.com/linux/linux_signing_key.pub | gpg --dearmor -o /usr/share/keyrings/dart.gpg
-RUN echo 'deb [signed-by=/usr/share/keyrings/dart.gpg arch=amd64] https://storage.googleapis.com/download.dartlang.org/linux/debian stable main' | tee /etc/apt/sources.list.d/dart_stable.list
-RUN apt-get update
 RUN apt-get install dart
 
 # Copy the rest of your action's code