Add external plugin cockroachdb (#2187)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

.github/plugin/marketplace.json

@@ -174,6 +174,32 @@
       "description": "Skills for CMS development across themes, plugins, admin tooling, media workflows, markdown rendering, and static export pipelines.",
       "version": "1.1.0"
     },
+    {
+      "name": "cockroachdb",
+      "description": "Connect GitHub Copilot to your CockroachDB clusters: run and explore SQL through MCP, with DBA/Developer/Operator agents, CockroachDB best-practice skills, and safety hooks that block destructive statements.",
+      "version": "0.1.4",
+      "author": {
+        "name": "Cockroach Labs",
+        "url": "https://github.com/cockroachdb"
+      },
+      "repository": "https://github.com/cockroachdb/copilot-plugin",
+      "license": "Apache-2.0",
+      "keywords": [
+        "cockroachdb",
+        "database",
+        "sql",
+        "distributed-sql",
+        "postgres-compatible",
+        "mcp",
+        "migration"
+      ],
+      "source": {
+        "source": "github",
+        "repo": "cockroachdb/copilot-plugin",
+        "ref": "v0.1.4",
+        "sha": "0874b16210768d54b273c1395d9715bc8638b347"
+      }
+    },
     {
       "name": "context-engineering",
       "source": "context-engineering",