add Dockerfile for container providing easy access to EESSI pilot repository

.github/workflows/test-containers.yml

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+name: Test containers
+
+on: [push, pull_request]
+
+jobs:
+  test-client-container:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Build the Docker image
+        run: docker build . --file containers/Dockerfile.EESSI-client-pilot-centos7

containers/Dockerfile.EESSI-client-pilot-centos7

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+FROM docker.io/library/centos:7.8.2003
+
+RUN yum install -y http://cvmrepo.web.cern.ch/cvmrepo/yum/cvmfs-release-latest.noarch.rpm \
+ && yum install -y cvmfs cvmfs-config-default cvmfs-fuse3 sudo vim openssh-clients \
+ && yum install -y https://github.com/EESSI/filesystem-layer/releases/download/v0.2.1/cvmfs-config-eessi-0.2.1-1.noarch.rpm
+
+RUN echo 'CVMFS_QUOTA_LIMIT=10000' > /etc/cvmfs/default.local \
+  && echo 'CVMFS_HTTP_PROXY="DIRECT"' >> /etc/cvmfs/default.local
+
+RUN mkdir -p /cvmfs/{cvmfs-config.eessi-hpc.org,pilot.eessi-hpc.org}
+
+RUN useradd -ms /bin/bash eessi

containers/Dockerfile.EESSI-client-pilot-centos7-arm64v8

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+FROM docker.io/arm64v8/centos:7
+
+RUN yum install -y http://cvmrepo.web.cern.ch/cvmrepo/yum/cvmfs-release-latest.noarch.rpm \
+ && yum install -y cvmfs cvmfs-fuse3 --nogpgcheck \
+ && yum install -y cvmfs-config-default sudo vim openssh-clients \
+ && yum install -y https://github.com/EESSI/filesystem-layer/releases/download/v0.2.1/cvmfs-config-eessi-0.2.1-1.noarch.rpm
+
+RUN echo 'CVMFS_QUOTA_LIMIT=10000' > /etc/cvmfs/default.local \
+  && echo 'CVMFS_HTTP_PROXY="DIRECT"' >> /etc/cvmfs/default.local
+
+RUN mkdir -p /cvmfs/{cvmfs-config.eessi-hpc.org,pilot.eessi-hpc.org}
+
+RUN useradd -ms /bin/bash eessi

containers/README.md

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+# Containers for EESSI
+
+This directory contains recipes for containers that are useful in the scope of the EESSI project.
+
+## Client container
+
+Container to provide easy access to EESSI pilot repository,
+see https://hub.docker.com/repository/docker/eessi/client-pilot and https://eessi.github.io/docs/pilot.
+
+### Build container
+
+```shell
+export EESSI_PILOT_VERSION=2020.09
+docker build --no-cache -f Dockerfile.EESSI-client-pilot-centos7 -t eessi/client-pilot:centos7-${EESSI_PILOT_VERSION} .
+```
+
+### Push to Docker Hub (requires credentials)
+
+```
+docker push eessi/client-pilot:centos7-${EESSI_PILOT_VERSION}
+```
+
+### Run (using Singularity)
+
+```
+mkdir -p /tmp/$USER/{var-lib-cvmfs,var-run-cvmfs,home}
+export SINGULARITY_BIND="/tmp/$USER/var-run-cvmfs:/var/run/cvmfs,/tmp/$USER/var-lib-cvmfs:/var/lib/cvmfs"
+export SINGULARITY_HOME="/tmp/$USER/home:/home/$USER"
+export EESSI_CONFIG="container:cvmfs2 cvmfs-config.eessi-hpc.org /cvmfs/cvmfs-config.eessi-hpc.org"
+export EESSI_PILOT="container:cvmfs2 pilot.eessi-hpc.org /cvmfs/pilot.eessi-hpc.org"
+singularity shell --fusemount "$EESSI_CONFIG" --fusemount "$EESSI_PILOT" docker://eessi/client-pilot:centos7-${EESSI_PILOT_VERSION}
+```