Cleanup

[kommendorkapten]

Closes https://github.com/github/package-security/issues/2848
Closes https://github.com/github/package-security/issues/2849

[Copilot]

Pull Request Overview

This PR cleans up existing logging statements by replacing fmt calls with log calls and adds a Docker build & test workflow.

• Update logging for improved clarity and consistency
• Add Docker image build/push workflow and a build/test workflow
• Make minor spelling corrections in log messages and comments

Reviewed Changes

Copilot reviewed 10 out of 12 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pkg/verifier/verifier.go	Replaced fmt with log for error reporting
pkg/verifier/multi.go	Updated error logging messages with log functions
pkg/provider/provider.go	Consistent log usage in provider validation errors
pkg/authn/provider.go	Updated logging related to keychain configuration
cmd/cver/cver.go	Logging adjustments in the CLI verification app
cmd/aaop/aaop.go	Replaced fmt with log and noted minor spelling issues
.github/workflows/docker.yaml	Added workflow to build and push Docker image
.github/workflows/build.yml	Added build and test workflow with a typo in a step name

Files not reviewed (2)

• Dockerfile: Language not supported
• Makefile: Language not supported

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