feat: Add automated Docker image usage instructions and PR comments

- Generate comprehensive usage instructions in workflow summary after Docker build
- Include exact docker pull commands with built image tags
- Auto-generate Claude Desktop configuration examples
- Add automatic PR comments with testing instructions for +docker builds
- Show expected image tags (pr-X, main-sha) in PR comments
- Include ready-to-use configuration snippets for immediate testing
- Link to GitHub Container Registry and Actions for monitoring

Now when Docker images are built, users get:
- Step-by-step usage instructions in workflow summary
- PR comments with exact pull commands and config
- Copy-paste ready Claude Desktop configurations
- Direct links to monitor build progress

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.github/workflows/auto-version.yml

@@ -177,6 +177,47 @@ jobs:
             -H "Accept: application/vnd.github.v3+json" \
             "https://api.github.com/repos/${{ github.repository }}/dispatches" \
             -d '{"event_type":"docker-build","client_payload":{"pr_number":"${{ github.event.pull_request.number }}","pr_title":"${{ github.event.pull_request.title }}","commit_sha":"${{ github.sha }}"}}'
+          
+          # Add comment to PR about Docker build
+          COMMENT_BODY="🐳 **Docker Image Build Triggered**
+
+This PR triggered a Docker image build because of the \`+docker\` suffix in the title.
+
+**Expected Image Tags:**
+- \`ghcr.io/${{ github.repository_owner }}/gemini-mcp-server:pr-${{ github.event.pull_request.number }}\`
+- \`ghcr.io/${{ github.repository_owner }}/gemini-mcp-server:main-${{ github.sha }}\`
+
+**To test the image after build completes:**
+\`\`\`bash
+docker pull ghcr.io/${{ github.repository_owner }}/gemini-mcp-server:pr-${{ github.event.pull_request.number }}
+\`\`\`
+
+**Claude Desktop config for testing:**
+\`\`\`json
+{
+  \"mcpServers\": {
+    \"gemini\": {
+      \"command\": \"docker\",
+      \"args\": [
+        \"run\", \"--rm\", \"-i\",
+        \"-e\", \"GEMINI_API_KEY\",
+        \"ghcr.io/${{ github.repository_owner }}/gemini-mcp-server:pr-${{ github.event.pull_request.number }}\"
+      ],
+      \"env\": {
+        \"GEMINI_API_KEY\": \"your-api-key-here\"
+      }
+    }
+  }
+}
+\`\`\`
+
+View the build progress in the [Actions tab](https://github.com/${{ github.repository }}/actions)."
+          
+          curl -X POST \
+            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+            -H "Accept: application/vnd.github.v3+json" \
+            "https://api.github.com/repos/${{ github.repository }}/issues/${{ github.event.pull_request.number }}/comments" \
+            -d "{\"body\":\"$COMMENT_BODY\"}"
         fi
 
     - name: Summary