#914 update fre-cli container files

[singhd789]

Describe your changes

• updates Dockerfile
  • to pull from an ubuntu base image (not condaforge)
  • installs micromamba and other packages needed for pp workflow
  • adds created conda envrionment to the path so that it is automatically loaded upon running the container
• updated cylc-flow-tools environment.yaml:
  • includes hsm 1.4.0, fre-nctools, and pip
• updates container readme and runscript

Issue ticket number and link (if applicable)

Fixes #914

Checklist before requesting a review

• I ran my code
• I tried to make my code readable
• I tried to comment my code
• I wrote a new test, if applicable
• I wrote new instructions/documentation, if applicable
• I ran pytest and inspected it's output
• I ran pylint and attempted to implement some of it's feedback
• No print statements; all user-facing info uses logging module

Note: If you are a code maintainer updating the tag or releasing a new fre-cli version, please use the release_procedure.md template. To quickly use this template, open a new pull request, choose your branch, and add ?template=release_procedure.md to the end of the url.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.09%. Comparing base (ad94447) to head (9c7b018).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #915   +/-   ##
=======================================
  Coverage   82.09%   82.09%           
=======================================
  Files          67       67           
  Lines        3736     3736           
=======================================
  Hits         3067     3067           
  Misses        669      669           

Flag	Coverage Δ
unittests	82.09% <ø> (ø)

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see 7 files with indirect coverage changes

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