fix: resolve Docker build failures by copying tsconfig.build.json

- Updated Dockerfile to copy all tsconfig*.json files (includes tsconfig.build.json)
- Updated Dockerfile.railway with same fix
- Changed standard Dockerfile to use 'tsc -p tsconfig.build.json' for consistency
- This fixes the missing file errors preventing Docker builds in CI

The issue was that tsconfig.build.json was added for the testing infrastructure
but the Docker COPY commands were not updated to include it.

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

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

Dockerfile

@@ -5,8 +5,8 @@
 FROM node:22-alpine AS builder
 WORKDIR /app
 
-# Copy tsconfig for TypeScript compilation
-COPY tsconfig.json ./
+# Copy tsconfig files for TypeScript compilation
+COPY tsconfig*.json ./
 
 # Create minimal package.json and install ONLY build dependencies
 RUN --mount=type=cache,target=/root/.npm \
@@ -19,7 +19,7 @@ RUN --mount=type=cache,target=/root/.npm \
 COPY src ./src
 # Note: src/n8n contains TypeScript types needed for compilation
 # These will be compiled but not included in runtime
-RUN npx tsc
+RUN npx tsc -p tsconfig.build.json
 
 # Stage 2: Runtime (minimal dependencies)
 FROM node:22-alpine AS runtime

Dockerfile.railway

@@ -9,8 +9,8 @@ WORKDIR /app
 RUN apk add --no-cache python3 make g++ && \
     rm -rf /var/cache/apk/*
 
-# Copy package files and tsconfig
-COPY package*.json tsconfig.json ./
+# Copy package files and tsconfig files
+COPY package*.json tsconfig*.json ./
 
 # Install all dependencies (including devDependencies for build)
 RUN npm ci --no-audit --no-fund