Docker WORKDIR causing bad image

Build Environment
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I have 3 projects using very similar (almost exact) Dockerfile. Two build images just fine on CircleCI but the third project builds an image successfully but when you try to run it, this error message is logged:

starting container process caused "chdir to cwd (\"/src\") set in config.json failed: not a directory"

/src is from WORKDIR in the Dockerfile below. Building locally works fine and the other 2 projects using WORKDIR on CircleCI work fine. I’ve tried using --rm=false and a clean cache to no avail.

Here is the Dockerfile:

FROM alpine:3.4

RUN wget "s3.amazonaws.com/aws-cli/awscli-bundle.zip" -O "awscli-bundle.zip" && \
    unzip awscli-bundle.zip && \
    apk add --update groff less python ca-certificates && \
    rm /var/cache/apk/* && \
    ./awscli-bundle/install -i /usr/local/aws -b /usr/local/bin/aws && \
    rm awscli-bundle.zip && \
    rm -rf awscli-bundle

EXPOSE 4000

WORKDIR /src

COPY scripts/entrypoint.sh .
COPY go_binary_built_outside_docker .

CMD ["./entrypoint.sh"]

Here is our circle.yml:

machine:
  environment:
      GODIST: "go1.7.4.linux-amd64.tar.gz"
      PROJECT_GOPATH: "${HOME}/.go_workspace"
      PROJECT_PARENT_PATH: "${PROJECT_GOPATH}/src/github.com/${CIRCLE_PROJECT_USERNAME}"
      PROJECT_PATH: "${PROJECT_PARENT_PATH}/${CIRCLE_PROJECT_REPONAME}"
      GOPATH: "${GOPATH}:${PROJECT_GOPATH}"
  post:
      - mkdir -p download
      - test -e download/$GODIST || curl -o download/$GODIST https://storage.googleapis.com/golang/$GODIST
      - sudo rm -rf /usr/local/go
      - sudo tar -C /usr/local -xzf download/$GODIST
      - go version
  services:
      - docker

dependencies:
  override:
    - mkdir -p "${PROJECT_PARENT_PATH}"
    - rsync -avC "${HOME}/${CIRCLE_PROJECT_REPONAME}/" "${PROJECT_PATH}"
  post:
    - mkdir -p $GOPATH/bin
    - make install

test:
  override:
    - cd "${PROJECT_PATH}" && make test

deployment:
  prod:
    branch: master
    commands:
      - cd "${PROJECT_PATH}" && make deploy

Here is our relevant Makefile:

build:
	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -o repo .;
# https://circleci.com/docs/docker-btrfs-error/
ifdef CI
	docker build --rm=false -t org/repo:$(CIRCLE_SHA1) .
else
	docker build -t org/repo:$(CIRCLE_SHA1) .
endif

Happy to provide any other details. Thanks for the help!