Add gallery blog post

portal/myst.yml

@@ -29,6 +29,7 @@ project:
       children:
       - title: "2026"
         children:
+        - file: posts/2026/gallery-listing.md
         - file: posts/2026/gh-actions.md
       - title: "2025"
         children:

portal/posts/2026/gallery-listing.md

@@ -0,0 +1,52 @@
+---
+title: "Rebuilding the Pythia Gallery on shared MyST tooling"
+subtitle: A few infrastructure improvements from the 2026 Cookoff
+date: 2026-06-23
+author: choldgraf
+description: How we used the Pythia Cookoff hackathon to rebuild the Cookbook Gallery and blog on reusable MyST tooling, and improve the clinder project along the way.
+tags: ["gallery", "myst", "hackathon"]
+---
+
+The [Project Pythia Cookbook Gallery](https://cookbooks.projectpythia.org/) is a central resource that Pythia uses to show off all the cookbooks its projects have created. Under the hood, it uses the [MyST Document Engine](https://mystmd.org) to execute and build each cookbook.
+
+```{figure} images/gallery-new.png
+The redesigned Cookbook Gallery, with a search bar and consistent cards.
+```
+
+Previously, the gallery ran on a collection of custom scripts and MyST plugins.
+This year at the [2026 Pythia Cookoff](https://projectpythia.org/pythia-cookoff-2026/) at NCAR, we used some hackathon time to rebuild it on upstream tooling that is more sustainable and re-usable across projects.
+Here's a quick summary of what we did:
+
+## Improving the gallery with a new myst-listing plugin
+
+The old gallery ran on a custom MyST extension that collected cookbook metadata from the Pythia organization and displayed it in a gallery of images.
+We decided to improve the UI and UX of this experience, and turn it into a Jupyter Book plugin in the new [`myst-contrib`](https://github.com/myst-contrib) GitHub organization.
+
+You can find the new [`myst-listing` plugin here](https://contrib.mystmd.org/myst-listing). It defines an experimental three-step process for **collecting** sources of content and information, **transforming** them by adding extra metadata, and **displaying** them in a variety of output styles.
+This is an experimental plugin, but we hope others can start to try it out and make improvements as they go along.
+
+Along the way, we switched the cookbooks gallery to use this new `myst-listing` plugin. To do this, we removed all of the old custom plugin code and replaced it with a [lightweight MyST plugin](https://github.com/ProjectPythia/cookbook-gallery/blob/main/src/pythia_gallery.py) that simply collects cookbook metadata from each repository, and uses the `myst-listing` plugin to render it into a nice gallery.
+We added the `searchfilter` plugin as well to get a nice search bar at the top.
+
+Check out [`cookbooks.projectpythia.org`](https://cookbooks.projectpythia.org) and the PR that implements this: https://github.com/ProjectPythia/cookbook-gallery/pull/33.
+
+## A new blog setup with the listing plugin
+
+We also decided to re-build the blog on the same `myst-listing` plugin.
+This was a way to test whether the plugin we'd created above could generalize to a new kind of use-case.
+The blog also used to be a collection of custom scripts and plugin code, and it's now replaced with a simple call to `:::{listing}`.
+Check out the PR that implements this: https://github.com/ProjectPythia/projectpythia.github.io/pull/582.
+
+## Executing cookbooks with remote kernels on Binder
+
+The week also gave us a reason to push on [`clinder`](https://2i2c-org.github.io/clinder/), our BinderHub CLI and GitHub Action for executing cookbooks with a remote kernel in the cloud.
+It lets a MyST or Jupyter Book build execute its notebooks on mybinder.org in CI instead of the runner, which is a nice fit for cookbook-style content.
+We added a documentation site, preview deploys, and tests on pull requests, so it's easier to pick up for your own builds.
+
+You can find a PR demoing this new functionality in [`pythia-foundations` PR #655](https://github.com/ProjectPythia/pythia-foundations/pull/655), where the build comment links to a [working preview of the book](https://ProjectPythia.github.io/pythia-foundations/_preview/655) executed on Binder.
+
+## Learn More
+- [Cookbook Gallery PR #33](https://github.com/ProjectPythia/cookbook-gallery/pull/33)
+- [Pythia blog and landing page PR #582](https://github.com/ProjectPythia/projectpythia.github.io/pull/582)
+- [`myst-listing` plugin docs](https://contrib.mystmd.org/myst-listing)
+- [`clinder` documentation](https://2i2c-org.github.io/clinder/)