Create a dockerfile for running the model code locally or in azure

[gvegayon]

• [x] Adds a Dockerfile that builds pyrenew.
• [x] Adds a workflow that builds the image and pushes it to ghcr.io/cdcgov/pyrenew:latest.
• [x] Extends the Makefile by adding a helper function and targets related to the container.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.03%. Comparing base (524f708) to head (938a760). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #107 +/- ## ========================================== + Coverage 91.48% 92.03% +0.54% ========================================== Files 33 34 +1 Lines 634 665 +31 ========================================== + Hits 580 612 +32 + Misses 54 53 -1 ``` | [Flag](https://app.codecov.io/gh/CDCgov/multisignal-epi-inference/pull/107/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CDCgov) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/CDCgov/multisignal-epi-inference/pull/107/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CDCgov) | `92.03% <ø> (+0.54%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CDCgov#carryforward-flags-in-the-pull-request-comment) to find out more.

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