#### Sequence diagram for the new CircleCI 'say-hello' workflow

[Dargon789]

Reviewer's Guide

Introduces a CircleCI pipeline by adding a new configuration file that defines a simple Docker-based 'say-hello' job and a workflow to run it.

Sequence diagram for the new CircleCI 'say-hello' workflow

sequenceDiagram
    actor Developer
    participant CodeRepo as "Code Repository"
    participant CircleCI
    participant DockerRuntime as "Docker Runtime (cimg/base:current)"

    Developer->>+CodeRepo: Push code
    CodeRepo->>+CircleCI: Trigger pipeline (on commit)
    CircleCI->>CircleCI: Parse .circleci/config.yml
    CircleCI->>CircleCI: Start workflow "say-hello-workflow"
    CircleCI->>+DockerRuntime: Execute job "say-hello"
    DockerRuntime->>DockerRuntime: Step: checkout code
    DockerRuntime->>DockerRuntime: Step: run "echo Hello, World!"
    DockerRuntime-->>-CircleCI: Job status (success/failure)
    CircleCI-->>-CodeRepo: Report build status
    alt Optional: Notification
        CodeRepo-->>-Developer: Notify build status
    end

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File-Level Changes

Change	Details	Files
Introduce CircleCI configuration	Add version: 2.1 header Define 'say-hello' job with Docker executor cimg/base:current Include checkout and run steps (echo Hello, World!) Configure 'say-hello-workflow' to invoke the job	.circleci/config.yml

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Originally posted by @sourcery-ai[bot] in #47 (comment)