Add auto-build artifacts workflow for schema updates

Co-authored-by: shreddd <[email protected]>

Author: Copilot

.github/workflows/auto-build-artifacts.yaml

@@ -0,0 +1,70 @@
+name: Auto-build artifacts on schema update
+
+on:
+  push:
+    branches:
+      - main
+      - develop
+    paths:
+      - 'src/schema/linkml/**'
+  pull_request:
+    paths:
+      - 'src/schema/linkml/**'
+
+jobs:
+  build-artifacts:
+    runs-on: ubuntu-latest
+    if: ${{ !contains(github.event.head_commit.message, '[skip artifacts]') }}
+    
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          fetch-depth: 0
+
+      - name: Set up Python 3.12
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.12
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
+
+      - name: Install dependencies
+        run: |
+          uv sync
+
+      - name: Generate artifacts
+        run: |
+          make gen-artefacts
+
+      - name: Check for changes
+        id: check_changes
+        run: |
+          git add src/schema/jsonschema/ src/schema/datamodel/
+          if git diff --staged --quiet; then
+            echo "changes=false" >> $GITHUB_OUTPUT
+          else
+            echo "changes=true" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Commit and push changes
+        if: steps.check_changes.outputs.changes == 'true' && github.event_name == 'push'
+        run: |
+          git config --local user.email "[email protected]"
+          git config --local user.name "GitHub Action"
+          git commit -m "Auto-generate artifacts from schema update [skip artifacts]"
+          git push
+
+      - name: Add PR comment for artifact changes
+        if: steps.check_changes.outputs.changes == 'true' && github.event_name == 'pull_request'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            github.rest.issues.createComment({
+              issue_number: context.issue.number,
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              body: '🤖 **Artifacts will be auto-generated** when this PR is merged due to schema changes in `src/schema/linkml/`.'
+            })