Unify CI workflow

[lucacome]

This pull request includes significant updates to the GitHub workflows and configuration files to streamline the CI/CD process. The most important changes include the consolidation of workflows, the addition of new steps for security and compliance, and updates to the README.md file.

Improvements to CI/CD workflows:

• Consolidated the workflows by removing .github/workflows/build-and-push.yaml and .github/workflows/release.yaml and creating a new .github/workflows/ci.yaml file that handles both CI and CD tasks. This new workflow includes steps for building and pushing Docker images, setting up the Golang environment, and running GoReleaser. [1] [2] [3]

Enhancements to build and security processes:

• Added steps in the new CI workflow to set up QEMU for cross-platform builds, inspect SBOM (Software Bill of Materials), and scan SBOM for vulnerabilities. These steps ensure that the built artifacts are secure and compliant with best practices.

Configuration updates:

• Updated .goreleaser.yaml to include SBOM generation for the artifacts.
• Added actionlint to the .pre-commit-config.yaml file to lint GitHub Actions workflows, ensuring that the workflows are syntactically correct and follow best practices.

Documentation improvements:

• Updated README.md to include badges for CI status and Go Report Card, providing visual indicators of the project's build status and code quality.