ci: publish server.json to the MCP registry via OIDC

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: emrberk

.github/workflows/mcp-registry.yml

@@ -0,0 +1,27 @@
+name: Publish to MCP Registry
+
+on:
+  workflow_dispatch:
+
+permissions:
+  id-token: write
+  contents: read
+
+jobs:
+  publish:
+    name: Publish server.json
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install mcp-publisher
+        run: |
+          curl -L "https://github.com/modelcontextprotocol/registry/releases/latest/download/mcp-publisher_$(uname -s | tr '[:upper:]' '[:lower:]')_$(uname -m | sed 's/x86_64/amd64/;s/aarch64/arm64/').tar.gz" | tar xz mcp-publisher
+
+      # A workflow in this org's repo gets io.github.questdb/* publish rights
+      # via OIDC; no personal login or org-owner account is involved.
+      - name: Login with GitHub Actions OIDC
+        run: ./mcp-publisher login github-oidc
+
+      - name: Publish
+        run: ./mcp-publisher publish