[EAGLE-6653]: Fix TypeError for checkpoint size from environment variable

[patricklundquist]

The CHECKPOINT_SIZE_BYTES environment variable is read as a string, which causes a TypeError when added to an integer. This change casts the value to an integer to prevent this error.

[github-actions]

Package	Line Rate	Health
clarifai	43%	❌
clarifai.cli	40%	❌
clarifai.cli.templates	28%	❌
clarifai.client	68%	➖
clarifai.client.auth	67%	➖
clarifai.constants	100%	✔
clarifai.datasets	100%	✔
clarifai.datasets.export	80%	✔
clarifai.datasets.upload	75%	➖
clarifai.datasets.upload.loaders	37%	❌
clarifai.models	100%	✔
clarifai.modules	0%	❌
clarifai.rag	72%	➖
clarifai.runners	53%	➖
clarifai.runners.models	60%	➖
clarifai.runners.pipeline_steps	44%	❌
clarifai.runners.pipelines	80%	✔
clarifai.runners.utils	63%	➖
clarifai.runners.utils.data_types	72%	➖
clarifai.schema	100%	✔
clarifai.urls	60%	➖
clarifai.utils	56%	➖
clarifai.utils.evaluation	67%	➖
clarifai.workflows	95%	✔
Summary	62% (7810 / 12654)	➖

Minimum allowed line rate is 50%

[wemoveon2]

alternatively, handle potential ValueError

s = os.environ.get('CHECKPOINT_SIZE_BYTES', '0')
if s.isdigit():
 checkpoint_size = int(s)
else:
 ...