Fix all LegacyKeyValueFormat docker warnings

[rkuo-danswer]

Description

Fixes DAN-784.

How Has This Been Tested?

[Describe the tests you ran to verify your changes]

Accepted Risk

[Any know risks or failure modes to point out to reviewers]

Related Issue(s)

[If applicable, link to the issue(s) this PR addresses]

Checklist:

• All of the automated tests pass
• All PR comments are addressed and marked resolved
• If there are migrations, they have been rebased to latest main
• If there are new dependencies, they are added to the requirements
• If there are new environment variables, they are added to all of the deployment methods
• If there are new APIs that don't require auth, they are added to PUBLIC_ENDPOINT_SPECS
• Docker images build and basic functionalities work
• Author has done a final read through of the PR right before merge

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Name	Status	Preview	Comments	Updated (UTC)
internal-search	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 7, 2024 10:32pm

[greptile-apps]

PR Summary

This pull request addresses LegacyKeyValueFormat Docker warnings by updating environment variable assignment syntax in multiple Dockerfiles.

• Updated PYTHONPATH syntax from 'ENV PYTHONPATH /app' to 'ENV PYTHONPATH=/app' in backend/Dockerfile
• Modified PYTHONPATH format in backend/Dockerfile.model_server to use equals sign
• Fixed PYTHONPATH declaration in backend/tests/integration/Dockerfile for correct test execution
• Added '=' signs between environment variable names and values in web/Dockerfile

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