fix: sync package.runtime.json version in Docker builds (v2.33.1) (#534)

Docker images were built with stale package.runtime.json (v2.29.5)
while npm package was at v2.33.0. This was caused by the build-docker
job not syncing the version before building, while publish-npm did.

Changes:
- Add "Sync runtime version" step to release.yml build-docker job
- Add "Sync runtime version" step to docker-build.yml build job
- Add "Sync runtime version" step to docker-build.yml build-railway job
- Bump version to 2.33.1 to trigger release with fix

The sync uses a lightweight Node.js one-liner (no npm install needed)
to update package.runtime.json version from package.json before
Docker builds.

Conceived by Romuald Czlonkowski - www.aiadvisors.pl/en

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

package.runtime.json

@@ -1,6 +1,6 @@
 {
   "name": "n8n-mcp-runtime",
-  "version": "2.29.5",
+  "version": "2.33.1",
   "description": "n8n MCP Server Runtime Dependencies Only",
   "private": true,
   "dependencies": {