fix: Remove .dockerignore to give clean working tree during Docker build (#1569)

* Remove .dockerignore from the project to give a clean git working tree during the build of the Docker image
   - The .dockerignore causes the a dirty working tree as the ignored files are viewed as missing and so setuptools_scm views the repo as being in a dev state and not a clean tag state
* As is, the .dockerignore is not even being used in a useful manner as the COPY command in the Dockerfile is in the first stage of a multistage build that both share the same base image, so the .dockerignore is unused by the final published image

Author: matthewfeickert