The README.md is inaccurate

[16c7x]

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The README states The latest version of the PDK is also pulled in at build time. but this is incorrect, the version of the PDK is fixed here

puppet-dev-tools/Dockerfile

Line 29 in dee7d91

&& apt-get install -y --no-install-recommends pdk=2.7.1.0-1buster \

sudo docker run puppet/puppet-dev-tools:4.x pdk --version 
2.7.1