#Docker image build and sign process in CI

[Dargon789]

Reviewer's Guide

Introduces a new GitHub Actions workflow (.github/workflows/docker.yml) to automate building, tagging, pushing, and signing Docker images on scheduled runs, pushes to main, and pull requests.

Flow diagram for Docker image build and sign process in CI

flowchart TD
  Start(["Workflow Triggered (push, PR, schedule)"]) --> Checkout(["Checkout Repository"])
  Checkout --> Buildx(["Set up Docker Buildx"])
  Buildx --> Metadata(["Extract Docker Metadata"])
  Metadata --> BuildPush(["Build and Push Docker Image"])
  BuildPush -->|if not PR| Login(["Log into Docker Registry"])
  BuildPush -->|if not PR| Sign(["Sign Docker Image (Cosign)"])
  Sign --> Rekor(["Rekor Transparency Log"])

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File-Level Changes

Change	Details	Files
Define workflow triggers and environment settings	Added schedule, push (branches and semver tags), and pull_request triggers Declared REGISTRY and IMAGE_NAME environment variables	.github/workflows/docker.yml
Implement build job with Docker build, push, and signing	Configured job permissions (contents, packages, id-token) and runner Checked out code and installed cosign except on PRs Set up Docker Buildx for multi-platform builds and cache management Logged into container registry when not in PR context Used docker/metadata-action to generate tags and labels Built and pushed the image with cache-from/to settings Signed the pushed image digest using cosign and GitHub OIDC	.github/workflows/docker.yml

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Originally posted by @sourcery-ai[bot] in #88 (comment)