docs: project github actions

docs/architecture/github-actions.md

@@ -0,0 +1,29 @@
+# Github actions
+
+These are the github actions used in the project.
+
+## Files
+
+```bash
+.github/workflows/
+├── deploy-docs.yml # (1)!
+└── new-issue-create-card.yml  # (2)!
+```
+
+1. Deploy Documentation
+    - triggered by commits to `main`
+    - builds and deploys the mkdocs documentation to github pages.
+1. Create card for new issues
+    - triggerd by new issue creation
+    - creates cards for new issues in the project board.
+    - no longer relevant after the project board migration, since the new project provides this automation.
+
+## Actions page workflows
+
+1. Create card for new issues
+    - see new-issue-create-card.yml above
+1. deploy-docs
+    - see deploy-docs.yml above
+1. pages-build-deployment
+    - The github-pages bot runs this automatically for any project that publishes to github pages.
+    - It does extra work that we don't need, but there's no way to disable it. See [here](https://stackoverflow.com/questions/72079903/do-i-need-the-pages-build-deployment-github-action-when-i-have-another-action-f).