MCP: Provide Java installation on CI/GHA

Author: amotl

.github/workflows/framework-mcp.yml

@@ -68,6 +68,12 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v5
 
+      - name: Install Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '21'
+
       - name: Install JBang
         uses: jbangdev/setup-jbang@main