set up CI

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diff --git a/.github/isabelle-action/Dockerfile b/.github/isabelle-action/Dockerfile
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+## Isabelle/Pure on Isabelle2020
+
+FROM ubuntu
+SHELL ["/bin/bash", "-c"]
+
+# packages
+ENV DEBIAN_FRONTEND=noninteractive
+RUN apt-get -y update && \
+  apt-get install -y curl less libfontconfig1 libgomp1 libwww-perl rlwrap unzip && \
+  apt-get clean
+
+# user
+RUN useradd -m isabelle && (echo isabelle:isabelle | chpasswd)
+USER isabelle
+
+# Isabelle
+WORKDIR /home/isabelle
+COPY Isabelle.tar.gz .
+RUN tar xzf Isabelle.tar.gz && \
+  mv Isabelle2020 Isabelle && \
+  perl -pi -e 's,ISABELLE_HOME_USER=.*,ISABELLE_HOME_USER="\$USER_HOME/.isabelle",g;' Isabelle/etc/settings && \
+  perl -pi -e 's,ISABELLE_LOGIC=.*,ISABELLE_LOGIC=Pure,g;' Isabelle/etc/settings && \
+  Isabelle/bin/isabelle build -o system_heaps -b Pure && \
+  rm Isabelle.tar.gz
+
+ENTRYPOINT ["Isabelle/bin/isabelle"]
+