Fix redis-proxy deployment docs: workflow trigger accuracy and docker run port mapping

[Copilot]

Two inaccuracies in docs/redis-proxy-deployment.md identified during review.

Changes

• Workflow trigger description — "on every push to main" was incorrect; the workflow only fires when specific paths change (cmd/redis-proxy/, proxy/, Dockerfile.redis-proxy, etc.). Updated to reflect the path-filtered behavior.
• Minimal docker run example — missing -p 6379:6379 meant the proxy was unreachable from the host in a typical local run. Added the port mapping.

docker run --rm \
  -p 6379:6379 \
  ghcr.io/bootjp/elastickv/redis-proxy:latest \
  -listen :6379 \
  -primary redis.internal:6379 \
  -mode redis-only

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