add --pull flag to build command

[sunkickr]

Description

Describe the purpose of this pull request.

🎟 Issue(s)

• Always --pull when building image #1407

🧪 Functional Testing

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

📸 Screenshots

Add screenshots to illustrate the validity of these changes.

📋 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

All modified lines are covered by tests ✅

Comparison is base (2841f46) 86.92% compared to head (210dce4) 86.94%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1415      +/-   ##
==========================================
+ Coverage   86.92%   86.94%   +0.02%     
==========================================
  Files         114      114              
  Lines       13953    13954       +1     
==========================================
+ Hits        12129    12133       +4     
+ Misses       1086     1084       -2     
+ Partials      738      737       -1     

Files	Coverage Δ
airflow/docker_image.go	83.10% <100.00%> (+0.04%)	⬆️

... and 2 files with indirect coverage changes

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[jedcunningham]

For historical purposes, this was reverted in #1431.