Add ASTRO_CLI env var to flow dockerfile

[feluelle]

Description

Describe the purpose of this pull request.

🎟 Issue(s)

Related astronomer/astro-sdk#1192

🧪 Functional Testing

List the functional testing steps to confirm this feature or fix.

📸 Screenshots

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📋 Checklist

• Rebased from the main (or release if patching) branch (before testing)
• Ran make test before taking out of draft
• Ran make lint before taking out of draft
• Added/updated applicable tests
• Tested against Astro-API (if necessary).
• Tested against Houston-API and Astronomer (if necessary).
• Communicated to/tagged owners of respective clients potentially impacted by these changes.
• Updated any related documentation

[codecov]

Codecov Report

Base: 87.11% // Head: 87.11% // No change to project coverage 👍

Coverage data is based on head (fe211bc) compared to base (033c89a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #855   +/-   ##
=======================================
  Coverage   87.11%   87.11%           
=======================================
  Files         100      100           
  Lines        8723     8723           
=======================================
  Hits         7599     7599           
  Misses        655      655           
  Partials      469      469           

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