Upgrade docker/login-action to fix ASF Allowlist failure

[jbampton]

Description

https://github.com/apache/infrastructure-actions/blob/d545588139850a104de28a3a203555f719e0393a/approved_patterns.yml#L164

docker/login-action@dbcb813

refs #14113

The ASF Allowlist failed on main:

https://github.com/apache/cloudstack/actions/runs/36711972556/job/109875691427

This PR...

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

[Copilot]

Copilot review overview

🟢 Approval recommended

The new SHA matches v4.6.0 and the ASF allowlist entry.

Review effort: Balanced
Findings: None

What changed in this PR

Updates the Docker registry login action to an ASF-approved version, restoring the allowlist check.

Changes:

• Pins docker/login-action to the allowlisted v4.6.0 commit.

File	Description
.github/​workflows/​docker-cloudstack-simulator.yml	Updates the Docker login action pin.

---

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.71%. Comparing base (1a48a87) to head (7cb736c).

❗ There is a different number of reports uploaded between BASE (1a48a87) and HEAD (7cb736c). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (1a48a87)	HEAD (7cb736c)
unittests	1	0

Additional details and impacted files

@@              Coverage Diff              @@
##               main   #14276       +/-   ##
=============================================
- Coverage     19.91%    3.71%   -16.21%     
=============================================
  Files          6373      487     -5886     
  Lines        577230    41992   -535238     
  Branches      70696     7942    -62754     
=============================================
- Hits         114950     1558   -113392     
+ Misses       449713    40208   -409505     
+ Partials      12567      226    -12341     

Flag	Coverage Δ
uitests	3.71% <ø> (ø)
unittests	?

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