add minimal ci

.github/workflows/test.yml

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+name: Test D2 Quarto Extension
+
+on: [push]
+
+jobs:
+  test_extension:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Quarto
+        uses: quarto-dev/quarto-actions/setup@v2
+
+      - name: Install D2 
+        run: curl -fsSL https://d2lang.com/install.sh | sh -s --
+
+      - name: Render Quarto document
+        run: |
+          cp -r _extensions tests
+          for file in $(find tests -name "*.qmd"); do
+            quarto render $file
+          done
+
+      - name: Upload PDF artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: rendered-output
+          path: tests

tests/example.qmd

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+---
+title: D2 Extension For Quarto
+format: gfm
+filters:
+  - d2
+d2:
+  layout: "elk"
+---
+
+This [Quarto](https://quarto.org) extension allows you to render [D2](https://d2lang.com) diagrams directly within your markdown documents. 
+
+Main features:
+
+- Render [D2](https://d2lang.com) diagrams directly within your [Quarto](https://quarto.org) markdown documents. 
+- Control the appearance and layout of your diagrams using global settings or code block attributes.
+- Tune the width and height of the resulting figures using the "width" and "height" arguments.
+
+This extension was inspired by [`ram02z/d2-filter`](https://github.com/ram02z/d2-filter).
+
+## Installation
+
+### Prerequisites
+
+Ensure that you have [D2](https://d2lang.com/tour/install) installed on your system.
+
+### Install
+
+Run the following command to add this extension to your current project:
+
+``` bash
+quarto add data-intuitive/quarto-d2
+```
+
+This will install the extension under the `_extensions` subdirectory.
+If you're using version control, you will want to check in this directory.
+
+
+
+## Example
+
+
+```{.d2 width="50%" echo="true"}
+logs: {
+  shape: page
+  style.multiple: true
+}
+user: User {shape: person}
+network: Network {
+  tower: Cell Tower {
+    satellites: {
+      shape: stored_data
+      style.multiple: true
+    }
+
+    satellites -> transmitter
+    satellites -> transmitter
+    satellites -> transmitter
+    transmitter
+  }
+  processor: Data Processor {
+    storage: Storage {
+      shape: cylinder
+      style.multiple: true
+    }
+  }
+  portal: Online Portal {
+    UI
+  }
+
+  tower.transmitter -> processor: phone logs
+}
+server: API Server
+
+user -> network.tower: Make call
+network.processor -> server
+network.processor -> server
+network.processor -> server
+
+server -> logs
+server -> logs
+server -> logs: persist
+
+server -> network.portal.UI: display
+user -> network.portal.UI: access {
+  style.stroke-dash: 3
+}
+```

tests/interactive.qmd

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+---
+title: "D2 Example"
+format: html
+filters:
+  - d2
+d2:
+  format: svg
+  embed_mode: raw
+---
+
+```{.d2 width="40%"}
+x { 
+  link: "https://quarto.org"
+}
+y {
+  tooltip: "This is a tooltip"
+}
+x -> y -> z
+```

tests/minimum.qmd

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+---
+title: "D2 Example"
+filters:
+  - d2
+---
+
+```{.d2}
+x -> y
+```