bugfix: fix hosts.toml format

[kakaZhou719]

Describe what this PR does / why we need it

server = "default-registry.com:5000"
  [host."default-registry.com:5000"]
    ca = "/etc/abc.key"

Does this pull request fix one issue?

Describe how you did it

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Special notes for reviews

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -5.80 ⚠️

Comparison is base (725730b) 18.90% compared to head (4b05e8e) 13.10%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2132      +/-   ##
==========================================
- Coverage   18.90%   13.10%   -5.80%     
==========================================
  Files          95      258     +163     
  Lines        8909    22198   +13289     
==========================================
+ Hits         1684     2910    +1226     
- Misses       6995    18902   +11907     
- Partials      230      386     +156     

Flag	Coverage Δ
e2e-tests	9.22% <ø> (?)
unit-tests	18.90% <ø> (ø)

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see 163 files with indirect coverage changes

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