Update README.md

README.md

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-# pfnano-image-build
+# PFNano conatainer image
+
+This container image had been built to investigate whether an increased timeout value solves the problem observed with the file access from eospublic.
+
+It has the PFNano code installed from https://github.com/cms-opendata-analyses/PFNanoProducerTool and compiled. See [Dockerfile](Dockerfile).
+
+The container is available from `ghcr.io/katilp/pfnano-image-build:main`
+
+The build is done in [the GitHub workflow](.github/workflows/docker-publish.yml). As it requires more space than is available in a normal GitHub runner, some unused libraries are removed from the runner in the workflow. This does not affect the resulting container.