Add CI section to developer guide

Signed-off-by: Michal Konečný <mkonecny@redhat.com>

modules/developer_guide/nav.adoc

@@ -6,6 +6,7 @@
 ** xref:frameworks.adoc[Frameworks and Tools]
 ** xref:db.adoc[Databases]
 ** xref:writing-tests.adoc[Tests]
+** xref:ci.adoc[CI]
 ** xref:auth.adoc[Authentication]
 ** xref:messaging.adoc[Messaging]
 ** xref:sops.adoc[Developing Standard Operating Procedures]

modules/developer_guide/pages/ci.adoc

@@ -0,0 +1,49 @@
+== CI (Continuous Integration)
+
+CI is an important part of development and it helps to keep the project maintainable.
+Fedora infra is using https://fedora.softwarefactory-project.io/zuul/status[Fedora CI].
+This CI is hosted by Fedora and open to any Fedora project.
+
+Fedora Infra also maintains their own https://pagure.io/fedora-infra/zuul[zuul jobs repository].
+This repository is open to contributions and every project in Fedora can use these jobs.
+
+=== Setting up CI for new project
+
+==== Pagure
+
+There is an https://fedoraproject.org/wiki/Zuul-based-ci#How_to_attach_a_Pagure_repository_on_Zuul[official
+guide] for new repositories that want to be added
+https://fedora.softwarefactory-project.io/zuul/status[Fedora CI].
+
+==== Github
+
+https://github.com/fedora-infra[Fedora Infra organization] on Github already has the corresponding
+application installed. To have it enabled for the project you need to
+https://fedoraproject.org/wiki/Zuul-based-ci#Add_the_repository_into_the_Zuul_configuration[add the repository to Zuul configuration] and create a `.zuul.yaml` file
+Following is the basic `zuul.yaml` file that could be used:
+
+....
+---
+# The root of the configuration is project
+- project:
+    check:
+      # Jobs to run on the project
+      # This example runs various tox environments
+      # More info about these jobs can be found on
+      # https://fedora.softwarefactory-project.io/zuul/jobs
+      jobs:
+        - fi-tox-mypy
+        - fi-tox-lint
+        - fi-tox-format
+        - fi-tox-python38
+        - fi-tox-python39
+        - fi-tox-python310
+        - fi-tox-docs:
+            vars:
+              dependencies:
+                - graphviz
+                - python3-sphinxcontrib-httpdomain
+                - python3-sqlalchemy_schemadisplay
+        - fi-tox-bandit
+        - fi-tox-diff-cover
+....