Add Copilot Coding Agent setup (#4840)

* Draft workflow

* Add context

* Fix script path

* Use sudo for installation

Author: theunrepentantgeek

.github/workflows/copilot-setup-steps.yml

@@ -0,0 +1,29 @@
+name: "Copilot Setup Steps"
+
+# Automatically run the setup steps when they are changed to allow for easy validation, and
+# allow manual testing through the repository's "Actions" tab
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+  pull_request:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+
+jobs:
+  # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
+  copilot-setup-steps:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: read
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # pinned to 4.1.7
+        with:
+          fetch-depth: 0 # required to access tags
+          submodules: 'true'
+
+      - name: Install Dependencies
+        run: sudo .devcontainer/install-dependencies.sh