Update Dockerfile

Dockerfile

@@ -9,8 +9,10 @@ RUN apt-get update && apt-get install -y \
     gnupg \
     lsb-release
 
+# Add Docker GPG key 
+RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 7EA0A9C3F273FCD8
+
 # Install Docker
-RUN curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
 RUN echo "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null
 RUN apt-get update && apt-get install -y docker-ce docker-ce-cli containerd.io