Implement RFC 30: Component metadata.

Co-authored-by: Catherine <whitequark@whitequark.org>

.github/workflows/main.yaml

@@ -126,6 +126,14 @@ jobs:
         with:
           name: docs
           path: docs/_build
+      - name: Extract schemas
+        run: |
+          pdm run extract-schemas
+      - name: Upload schema archive
+        uses: actions/upload-artifact@v4
+        with:
+          name: schema
+          path: schema
 
   check-links:
     runs-on: ubuntu-latest
@@ -154,6 +162,30 @@ jobs:
     steps:
       - run: ${{ contains(needs.*.result, 'failure') && 'false' || 'true' }}
 
+  publish-schemas:
+    needs: document
+    if: ${{ github.repository == 'amaranth-lang/amaranth' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out source code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Download schema archive
+        uses: actions/download-artifact@v4
+        with:
+          name: schema
+          path: schema/
+      - name: Publish development schemas
+        if: ${{ github.event_name == 'push' && github.event.ref == 'refs/heads/main' }}
+        uses: JamesIves/github-pages-deploy-action@releases/v4
+        with:
+          repository-name: amaranth-lang/amaranth-lang.github.io
+          ssh-key: ${{ secrets.PAGES_DEPLOY_KEY }}
+          branch: main
+          folder: schema/
+          target-folder: schema/amaranth/
+
   publish-docs:
     needs: document
     if: ${{ github.repository == 'amaranth-lang/amaranth' }}