se adiciona archivo faltante

FossilOrigin-Name: 9b5286528fbefb452e42cf375031ad4037220fc5643bfb0dd9b1106d37544789

Dockerfile

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+# DERIVADO DE https://alextereshenkov.github.io/run-python-tests-with-tox-in-docker.html
+FROM ubuntu:18.04
+
+RUN apt-get -qq update
+RUN apt-get install -y --no-install-recommends \
+  python3.7 python3.7-distutils python3.7-dev \
+  python3.8 python3.8-distutils python3.8-dev \
+  wget \
+  ca-certificates
+
+RUN wget https://bootstrap.pypa.io/get-pip.py \
+  && python3 get-pip.py pip==21.3 \
+  && python3.7 get-pip.py pip==21.3 \
+  && python3.8 get-pip.py pip==21.3 \
+  && rm get-pip.py
+
+RUN apt-get install -y --no-install-recommends \
+        libxml2-dev \
+        libxmlsec1-dev \
+        build-essential
+
+RUN python3.6 --version
+RUN python3.7 --version
+RUN python3.8 --version
+
+RUN pip3.6 install setuptools setuptools-rust
+RUN pip3.7 install setuptools setuptools-rust
+RUN pip3.8 install setuptools setuptools-rust
+
+RUN pip3 install tox pytest