Set up weekly test runs

[ejm714]

• Set up weekly test runs for Sundays
• Add workflow dispatch so we can trigger runs manually if desired

Closes #188

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[codecov-commenter]

Codecov Report

Merging #251 (187ebb7) into master (386e0e0) will decrease coverage by 0.3%. The diff coverage is n/a.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #251 +/- ## ======================================== - Coverage 87.6% 87.2% -0.4% ======================================== Files 31 31 Lines 2164 2164 ======================================== - Hits 1896 1889 -7 - Misses 268 275 +7 ``` | [Impacted Files](https://codecov.io/gh/drivendataorg/zamba/pull/251?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=drivendataorg) | Coverage Δ | | |---|---|---| | [zamba/models/depth\_estimation/depth\_manager.py](https://codecov.io/gh/drivendataorg/zamba/pull/251/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=drivendataorg#diff-emFtYmEvbW9kZWxzL2RlcHRoX2VzdGltYXRpb24vZGVwdGhfbWFuYWdlci5weQ==) | `93.3% <0.0%> (-5.9%)` | :arrow_down: |