Add Python and build tools to Dockerfile build stage

[railway-app]

Problem

The Docker build fails in the build stage when npm install -g flowise triggers node-gyp to compile better-sqlite3 from source. The bare node:20-alpine image has no Python, make, or g++, so node-gyp cannot find a Python installation and the build errors out. These tools were only present in the runtime stage, not the build stage where they're actually needed.

Solution

Added RUN apk add --no-cache python3 make g++ build-base to the build stage in docker/Dockerfile, before the npm install -g flowise command. This gives node-gyp everything it needs to compile native modules from source when prebuilt binaries aren't available for the current Node.js version on Alpine Linux (musl libc).

Changes

• Modified docker/Dockerfile

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