Improve base image handling and update verification docs

[0xh3rman]

• Enhanced the base image logic in verify_apk.py to support pulling from remote by default, with an option to skip via VERIFY_PULL_BASE.
• Updated README.md to clarify the CI workflow, base image publishing, and verification steps, providing more explicit instructions for image selection and usage.

[gemini-code-assist]

Summary of Changes

Hello @0xh3rman, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the reproducible build verification process by introducing default remote pulling for base Docker images and providing more explicit control over this behavior. It also significantly updates the verification documentation to guide users through the updated workflow, including how base images are published and utilized. These changes aim to enhance the reliability and clarity of the build verification system.

Highlights

• Default Remote Base Image Pulling: The verify_apk.py script now defaults to pulling the base Docker image from a remote registry, improving consistency and ensuring the latest images are used.
• Configurable Base Image Pull: Users can now skip the remote base image pull by setting the VERIFY_PULL_BASE=false environment variable, allowing for local image usage or rebuilds.
• Dynamic Base Image Tag Selection: The base image tag for verification now intelligently defaults to the tag being verified, or falls back to a default if VERIFY_BASE_TAG is not explicitly provided.
• Enhanced Documentation: The README.md has been updated to provide clearer instructions on the CI workflow, base image publishing to GHCR, and the verification process, including how base images are selected and used.
• Improved Git Reference Resolution: The resolve_ref function in verify_apk.py has been made more robust to correctly handle annotated Git tags by explicitly resolving their peeled commit SHAs.

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[gemini-code-assist]

Code Review

This pull request improves the base image handling for APK verification by adding support for pulling images from a remote registry by default. This is a great enhancement for CI/CD pipelines. The logic to fall back to local images or building from scratch is also well-implemented. The documentation in README.md has been updated accordingly to reflect these changes, which is very helpful.

I've found one potential issue in verify_apk.py regarding how git refs are resolved, which could lead to ambiguity. My suggestion aims to make the ref matching more robust. Overall, this is a solid improvement to the verification process.