ci: use disk-space-reclaimer in build_docker workflow

[Copilot]

The build_docker job runs out of disk space with current manual cleanup (rm -rf /opt/hostedtoolcache).

Changes

• Replace manual cleanup with insightsengineering/disk-space-reclaimer@v1 action in build_docker job
• Configure comprehensive cleanup: tools-cache, Android SDK, .NET SDK, Haskell, large-packages, swap-storage, and docker-images

This frees up significantly more space than the previous manual approach by removing multiple pre-installed components that consume disk space on GitHub Actions runners.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Fix disk space shortage in build_docker action</issue_title>
<issue_description>The build_docker action is running out of disk space. Although some pre-installed software is currently being removed, it is not enough.

Proposed Solution:
Use insightsengineering/disk-space-reclaimer@v1 to free up more space.

Configuration:

- name: Free Disk Space (Ubuntu)
  uses: insightsengineering/disk-space-reclaimer@v1
  with:
    tools-cache: true
    android: true
    dotnet: true
    haskell: true
    large-packages: true
    swap-storage: true
    docker-images: true

---

Generated by OpenClaw</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Fix disk space shortage in build_docker action #5241

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[Copilot]

Pull request overview

This PR addresses disk space issues in the build_docker job by replacing manual cleanup with a more comprehensive automated solution. The build_docker job was running out of disk space despite removing /opt/hostedtoolcache, and this change adopts a proven action that frees up significantly more space.

Changes:

• Replace manual rm -rf /opt/hostedtoolcache cleanup with insightsengineering/disk-space-reclaimer@v1 action
• Configure comprehensive cleanup of tools-cache, Android SDK, .NET SDK, Haskell, large-packages, swap-storage, and docker-images

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.07%. Comparing base (f6d5d95) to head (d04c558).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5242   +/-   ##
=======================================
  Coverage   82.06%   82.07%           
=======================================
  Files         732      732           
  Lines       73974    73974           
  Branches     3615     3615           
=======================================
+ Hits        60710    60711    +1     
  Misses      12100    12100           
+ Partials     1164     1163    -1     

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