Migrate pkg/container, pkg/secrets, pkg/config from logger shim to slog

[rdimitrov]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 19.23077% with 105 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.80%. Comparing base (7c88309) to head (6e2dc30).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/container/docker/client.go	3.44%	28 Missing ⚠️
pkg/container/kubernetes/client.go	17.24%	24 Missing ⚠️
pkg/container/docker/sdk/client_unix.go	16.66%	20 Missing ⚠️
pkg/container/images/registry.go	20.00%	8 Missing ⚠️
pkg/container/verifier/attestations.go	0.00%	5 Missing ⚠️
pkg/container/verifier/sigstore.go	0.00%	4 Missing ⚠️
pkg/container/verifier/verifier.go	0.00%	3 Missing ⚠️
pkg/config/registry.go	0.00%	2 Missing ⚠️
pkg/container/docker/squid.go	50.00%	2 Missing ⚠️
pkg/container/images/image.go	0.00%	2 Missing ⚠️
... and 6 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3861      +/-   ##
==========================================
- Coverage   66.80%   66.80%   -0.01%     
==========================================
  Files         444      444              
  Lines       44070    44071       +1     
==========================================
- Hits        29442    29441       -1     
  Misses      12322    12322              
- Partials     2306     2308       +2     

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