INTPYTHON-611 Make it easier to run patch builds

[blink1073]

Patch build: https://spruce.mongodb.com/version/682207ba29bc5200076d2ad0/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC

Run with: --param REPO_ORG=blink1073 --param REPO_BRANCH=test-branch

Relevant logs:

 [2025/05/12 09:39:09.732] Running command 'subprocess.exec' in function 'fetch repo' (step 1 of 3).
 [2025/05/12 09:39:10.030] Cloning repo -b test-branch https://github.com/blink1073/langchain-mongodb...
 [2025/05/12 09:39:10.030] Cloning repo -b test-branch https://github.com/blink1073/langchain-mongodb... done.
 [2025/05/12 09:39:10.030] Cloning into 'langchain-mongodb'...
 [2025/05/12 09:39:10.030] Finished command 'subprocess.exec' in function 'fetch repo' (step 1 of 3) in 298.018571ms.

[2025/05/12 09:49:24.249] Running command 'subprocess.exec' (step 2 of 2) in block 'post'.
[2025/05/12 09:49:24.251] REPO_ORG=blink1073
[2025/05/12 09:49:24.251] REPO_BRANCH=test-branch
[2025/05/12 09:49:24.251] Finished command 'subprocess.exec' (step 2 of 2) in block 'post' in 1.299166ms.

[Jibola]

nit

[caseyclements]

Awesome!

[blink1073]

@jib this is ready for a re-review