Add CI graph to the documentation

Author: aobolensk

docs/_static/.gitkeep

@@ -11,3 +11,4 @@ Below is the table of contents for the Parallel Programming Course documentation
    user_guide/download
    user_guide/environment
    user_guide/submit_work
+   user_guide/ci

docs/_static/ci_graph.svg

@@ -0,0 +1,15 @@
+Continuous Integration (CI)
+============================
+
+Students need to pass all the checks in the CI pipeline before their work can be considered for submission.
+This includes successful code checkout, build ans testing stages.
+Each integration is verified by an automated build and automated tests.
+
+CI Pipeline
+------------
+
+The CI pipeline for this project is illustrated in the following diagram:
+
+.. image:: ../_static/ci_graph.svg
+    :alt: CI Pipeline Diagram
+    :align: center

docs/index.rst

@@ -0,0 +1,43 @@
+import os
+
+try:
+    import yaml
+except ImportError:
+    print("Please install pyyaml: pip install pyyaml")
+    exit(1)
+
+try:
+    import graphviz
+except ImportError:
+    print("Please install graphviz: pip install graphviz")
+    exit(1)
+
+
+def parse_gha_yml(file_path):
+    with open(file_path, "r") as file:
+        gha_data = yaml.safe_load(file)
+    return gha_data
+
+def build_jobs_graph(gha_data):
+    jobs = gha_data.get("jobs", {})
+    dot = graphviz.Digraph()
+
+    for job_name, job_data in jobs.items():
+        dot.node(job_name)
+        needs = job_data.get("needs", [])
+        if isinstance(needs, str):
+            needs = [needs]
+        for dependency in needs:
+            dot.edge(dependency, job_name)
+
+    return dot
+
+def save_graph(dot, filename, file_format):
+    dot.render(filename, format=file_format, cleanup=True)
+
+if __name__ == "__main__":
+    gha_file_path = os.path.join(".github", "workflows", "main.yml")
+    svg_path = os.path.join("docs", "_static", "ci_graph")
+    gha_data = parse_gha_yml(gha_file_path)
+    jobs_graph = build_jobs_graph(gha_data)
+    save_graph(jobs_graph, svg_path, "svg")