Adding files needed to create a container able to store the spanish digital certificate.

Dockerfile

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+FROM debian:sid
+COPY ./id_rsa.pub /id_rsa.pub
+COPY ./configuradorfnmt_1.0.1-0_amd64.deb.sha512sum /configuradorfnmt_1.0.1-0_amd64.deb.sha512sum
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt update 
+RUN apt dist-upgrade -y 
+RUN apt install -y curl
+RUN curl -O -L 'https://descargas.cert.fnmt.es/Linux/configuradorfnmt_1.0.1-0_amd64.deb'
+RUN [ "$(sha512sum /configuradorfnmt_1.0.1-0_amd64.deb | awk '{ print $1 }' )" = "$(cat /configuradorfnmt_1.0.1-0_amd64.deb.sha512sum | awk '{ print $1 }')" ]
+RUN apt install -y openssh-server 
+RUN useradd -m sergio -s /bin/bash && su sergio -c "mkdir ~/.ssh" 
+RUN cat /id_rsa.pub >> /home/sergio/.ssh/authorized_keys
+RUN apt install -y libgtk2.0-0
+RUN apt install -y libcanberra-gtk-module
+RUN apt install -y libcanberra-gtk3-module
+RUN apt install -y libpcsclite1
+RUN apt install -y firefox
+RUN apt install -y gconf2
+RUN dpkg -i /configuradorfnmt_1.0.1-0_amd64.deb
+RUN ssh-keygen -A
+RUN apt-get install -y xorg
+RUN mkdir -p /run/sshd
+RUN apt install -y openbox
+RUN echo "X11UseLocalhost no" >> /etc/ssh/sshd_config
+
+EXPOSE 22/tcp
+CMD ["/usr/sbin/sshd", "-D"]

configuradorfnmt_1.0.1-0_amd64.deb.sha512sum

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+742cc8d6ff502f4baae3cab564aced6c9f66d6b7b24be4823ab0c1983831a5351a0cc92db8f05a90f0fbcc52425ff0d331685cac8f6acaf5c1d3633827069ba0