@WoLfulus 👋

I tried reproducing this with our sample-dockerfile repo.

git clone https://github.com/digitalocean/sample-dockerfile.git
cd sample-dockerfile
doctl app create --spec .do/app.yaml

This creates an app from a multi-stage Dockerfile similar to what you’re describing:

FROM golang:1.12-alpine as builder
WORKDIR /app
COPY . .
RUN go build -mod=vendor -o bin/hello

FROM alpine
RUN apk --no-cache add ca-certificates
WORKDIR /root/
COPY --from=builder /app/bin/hello /usr/local/bin/
CMD ["hello"]

Then, updating that to a single stage Dockerfile and redeploying:

git checkout one-stage

Dockerfile:

FROM golang:1.12-alpine
WORKDIR /app
COPY . .
RUN go build -mod=vendor -o bin/hello && \
    cp bin/hello /usr/local/bin/hello
RUN apk --no-cache add ca-certificates
CMD ["hello"]

doctl app update $APP_ID --spec .do/app.yaml

My build + deploy succeeded. Are you able to share more of your dockerfiles or simplified versions that can be used to reproduce?