chore: add fix-missing to apt update in docker (ietf-tools#3796)

Author: NGPixel

dev/tests/Dockerfile

@@ -15,7 +15,7 @@ RUN echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/d
     $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null
 
 # Install the packages we need
-RUN apt-get update
+RUN apt-get update --fix-missing
 RUN apt-get install -qy \
 	apache2-utils \
 	apt-file \

docker/app.Dockerfile

@@ -18,7 +18,7 @@ RUN curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /
 RUN echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/debian \
     $(lsb_release -cs) stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null
 
-RUN apt-get update
+RUN apt-get update --fix-missing
 
 # apt-get upgrade is normally not a good idea, but this is a dev container
 RUN apt-get -qy upgrade