Update to Ubuntu bionic - #4
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Installing the pdf package via pip currently fails with the error: ``` Could not find a version that satisfies the requirement pdf (from versions: ) No matching distribution found for pdf ``` PyPDF2 [1] has a similar set of functionality and installs cleanly. [1] https://pythonhosted.org/PyPDF2/
Also: assorted improvements to reduce images size. Previously, the image was 1.15GB in size. Combining the layers, cleaning up after each layer (to avoid results that are later cleaned up being written into the intermediate images), removing the pip cache and avoiding to install recommended packages brings down the size by about 30% to 827MB.
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Note that this pull request depends on #2 and #3 and so should be reviewed/merged after them.
This pull request updates the image to the latest Ubuntu version (bionic). This enables us to get rid of the custom PPA for Python 3.6 since that is now the default version.
The pull request also introduces assorted improvements to reduce images size. Previously, the image was 1.15GB in size. Combining the layers, cleaning up after each layer (to avoid results that are later cleaned up being written into the intermediate images), removing the pip cache and avoiding to install recommended packages brings down the size by about 30% to 827MB. The smaller image size is notable when running the autograder on a service like Azure Container Instances or AWS Fargate.