Optimize the Dockerfiles

[Smankusors]

Change Description

This PR optimizes the Dockerfiles so that the final build image size is reduced. The big size is mostly caused by the en_core_web_lg package is being cached on /root/.cache. So by adding ENV PIP_NO_CACHE_DIR=1, the pip will not cache it anymore, reducing the image size.

I also merge some RUN commands into one RUN, so that it results to 1 layer instead of many layers.

                         BEFORE   AFTER
presidio-analyzer        2.1GB    1.26GB
presidio-anonymizer      212MB    196MB
presidio-image-redactor  2.34GB   1.46GB

Checklist

• I have reviewed the contribution guidelines
• I have signed the CLA
• My code includes unit tests
• All unit tests and lint checks pass locally
• My PR contains documentation updates / additions if required

[ghost]

All CLA requirements met.

[omri374]

Cool thanks! We'll review it soon.

[omri374]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[SharonHart]

Looks great, thanks!