reduce number of docker layers

Author: d-w-moore

irods/test/harness/000_install-irods.Dockerfile

@@ -1,15 +1,14 @@
 FROM ubuntu:22.04
 COPY install.sh /
 ARG irods_package_version
-ENV IRODS_PACKAGE_VERSION "$irods_package_version"
+ENV IRODS_PACKAGE_VERSION="$irods_package_version"
 RUN for phase in initialize install-essential-packages add-package-repo; do \
         bash /install.sh --w=$phase 0; \
-    done
-RUN /install.sh 4
+    done && \
+    /install.sh 4
 COPY start_postgresql_and_irods.sh manage_irods5_procs /
-RUN apt install -y sudo
-RUN useradd -ms/bin/bash testuser
-RUN echo 'testuser ALL=(ALL) NOPASSWD: ALL' >>/etc/sudoers
-RUN apt install -y faketime
+RUN apt install -y sudo && \
+    useradd -ms/bin/bash testuser && \
+    echo 'testuser ALL=(ALL) NOPASSWD: ALL' >>/etc/sudoers
 ENV IRODS_CONTROL_PATH=""
 CMD bash $IRODS_CONTROL_PATH/start_postgresql_and_irods.sh

irods/test/harness/001_bats-and-system-python.Dockerfile

@@ -0,0 +1,6 @@
+FROM install-irods
+RUN apt update
+RUN apt install -y python3-pip bats && \
+    python3 -m pip install --upgrade pip && \
+    python3 -m pip install virtualenv && \
+    python3 -m virtualenv /py3

irods/test/harness/001_bats-python3.Dockerfile

@@ -0,0 +1,16 @@
+FROM bats-and-system-python
+RUN apt update && \
+    apt install -y wget build-essential && \
+    apt install -y libssl-dev zlib1g-dev libffi-dev libncurses-dev wget build-essential
+ARG python_version
+RUN wget https://www.python.org/ftp/python/${python_version}/Python-${python_version}.tar.xz && \
+    tar xf Python-${python_version}.tar.xz
+WORKDIR /Python-${python_version}
+RUN ./configure --prefix /root/python --with-ensurepip=install && \
+    make -j && \
+    mkdir /root/python && \
+    make install
+WORKDIR /
+RUN /root/python/bin/python3 -m pip install virtualenv && \
+    chmod a+rx /root
+ENV PYTHON_VERSION=${python_version}