Add documentation on updating Octue services

.pre-commit-config.yaml

@@ -13,7 +13,7 @@ repos:
       - id: check-added-large-files
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.6.2
+    rev: v0.6.9
     hooks:
       - id: ruff
         args: [--fix, --exit-non-zero-on-fix]

docs/source/index.rst

@@ -85,6 +85,7 @@ We use `GitHub Issues <https://github.com/octue/octue-sdk-python/issues>`_ [#]_
    services
    asking_questions
    creating_services
+   updating_services
    running_services_locally
    deploying_services
    testing_services

docs/source/updating_services.rst

@@ -0,0 +1,95 @@
+.. _updating_services:
+
+Updating an Octue service
+=========================
+
+This page describes how to update an existing, deployed Octue service - in other words, how to deploy a new Octue
+service revision.
+
+We assume that:
+
+- Your service's repository is on GitHub and you have push access to it
+- Octue's `standard deployment GitHub Actions workflow <https://github.com/octue/workflows/blob/main/.github/workflows/deploy-cloud-run-service.yml>`_
+  is set up in the repository and being used to deploy the service to Google Cloud Run on merge of a pull request into
+  the ``main`` branch (see an example `here <https://github.com/octue/example-service-cloud-run/blob/main/.github/workflows/cd.yaml>`_)
+- A release workflow is set up that will tag and release the new service revision on GitHub (see an example
+  `here <https://github.com/octue/example-service-cloud-run/blob/main/.github/workflows/release.yml>`_)
+
+Instructions
+-------------
+
+1. Check out and pull the ``main`` branch to make sure you're up to date with the latest changes
+
+   .. code-block:: shell
+
+       git checkout main
+       git pull
+
+2. Install your service locally so you can run the tests and your development environment can lint the code etc.:
+
+   .. code-block:: shell
+
+       poetry install
+
+3. Set up `pre-commit <https://pre-commit.com/>`_ to enforce code quality:
+
+   .. code-block:: shell
+
+       pre-commit install && pre-commit install -t commit-msg
+
+4. Check out a new branch so you can work independently of any other work on the code happening at the same time
+
+   .. code-block:: shell
+
+       git checkout -b my-new-feature
+
+5. Add and make changes to your app's code as needed, committing each self-contained change. Use the `Conventional
+   Commits <https://www.conventionalcommits.org/en/v1.0.0/>`_ commit message format so the new version for your service
+   can be automatically calculated.
+
+   .. code-block:: shell
+
+       git add a-new-file another-new-file
+       git commit -m "Your commit message"
+       ...repeat...
+
+   Push your commits frequently so your work is backed up on GitHub
+
+   .. code-block:: shell
+
+       git push
+
+6. Write any new tests you need to verify your code works and update any old tests as needed
+
+7. Run the tests locally using ``pytest`` and fix anything that makes them fail
+
+   .. image:: images/updating_services/pytest.png
+
+8. Update the `semantic version <https://semver.org/>`_ of your app. This communicates to anyone updating from a
+   previous version of the service whether they can use it as before or if there might be changes they need to make to
+   their own code or data first.
+
+   - ``poetry version patch`` for a bug fix or small non-code change
+   - ``poetry version minor`` for a new feature
+   - ``poetry version major`` for a breaking change
+
+   Don't forget to commit this change, too.
+
+9. When you're ready to review the changes, head to GitHub and open a pull request of your branch into ``main``. This
+   makes it easy for you and anyone else to see what's changed. Check the "Files Changed" tab to make sure everything's
+   there and consistent (it's easy to forget to push a commit). Ask your colleagues to review the code if required.
+
+   .. image:: images/updating_services/diff.png
+
+10. When you're ready to release the new version of your service, check that the GitHub checks have passed. These ensure
+    code quality, that the tests pass, and that the new version number is correct.
+
+   .. image:: images/updating_services/checks.png
+
+11. Merge the pull request into ``main``. This will run the deployment workflow (usually called ``cd`` - continuous
+    deployment), making the new version of the service available to everyone.
+
+12. Check that the deployment workflow has run successfully (this can take a few minutes). You can check the progress in
+    the "Actions" tab of the GitHub repository
+
+   .. image:: images/updating_services/deployment.png