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diff --git a/taskcluster/docker/ubuntu1804-base/Dockerfile b/taskcluster/docker/ubuntu1804-base/Dockerfile
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+FROM $DOCKER_IMAGE_PARENT
+MAINTAINER Mike Hommey <mhommey@mozilla.com>
+
+### Add worker user and setup its workspace.
+RUN mkdir /builds && \
+    groupadd -g 1000 worker && \
+    useradd -u 1000 -g 1000 -d /builds/worker -s /bin/bash -m worker && \
+    mkdir -p /builds/worker/workspace && \
+    chown -R worker:worker /builds
+
+# Declare default working folder
+WORKDIR /builds/worker
+
+VOLUME /builds/worker/checkouts
+VOLUME /builds/worker/workspace
+VOLUME /builds/worker/tooltool-cache
+
+# Set variable normally configured at login, by the shells parent process, these
+# are taken from GNU su manual
+ENV HOME=/builds/worker \
+    SHELL=/bin/bash \
+    USER=worker \
+    LOGNAME=worker \
+    HOSTNAME=taskcluster-worker
+
+# Set a default command useful for debugging
+CMD ["/bin/bash", "--login"]
+
+ARG TASKCLUSTER_ROOT_URL
+ARG DOCKER_IMAGE_PACKAGES
+RUN /usr/local/sbin/setup_packages.sh $TASKCLUSTER_ROOT_URL $DOCKER_IMAGE_PACKAGES && \
+    apt-get update && \
+    apt-get dist-upgrade && \
+    apt-get install \
+      git \
+      less \
+      make \
+      mercurial \
+      patch \
+      python3.8 \
+      python3.8-dev \
+      python3.8-venv \
+      python3-minimal \
+      python3-zstandard \
+      python3-psutil \
+      python3-venv \
+      vim-tiny \
+      xz-utils \
+      zstd \
+    && /usr/local/sbin/clean_packages.sh $DOCKER_IMAGE_PACKAGES
+
+RUN test $(readlink /usr/bin/python3) = python3.6 && ln -sf python3.8 /usr/bin/python3
+
+# %include testing/mozharness/external_tools/robustcheckout.py
+COPY topsrcdir/testing/mozharness/external_tools/robustcheckout.py /usr/local/mercurial/robustcheckout.py
+
+# %include taskcluster/docker/recipes/hgrc
+COPY topsrcdir/taskcluster/docker/recipes/hgrc /etc/mercurial/hgrc.d/mozilla.rc
+
+# Add pip configuration, among other things.
+# %include taskcluster/docker/recipes/dot-config
+COPY topsrcdir/taskcluster/docker/recipes/dot-config /builds/worker/.config
+
+# %include taskcluster/scripts/run-task
+COPY topsrcdir/taskcluster/scripts/run-task /builds/worker/bin/run-task
+
+# %include taskcluster/scripts/misc/fetch-content
+ADD topsrcdir/taskcluster/scripts/misc/fetch-content /builds/worker/bin/fetch-content
+
+RUN chown -R worker:worker /builds/worker/bin && chmod 755 /builds/worker/bin/*