AWS Lambda with Docker Container runtime error: “Init failed error=fork/exec /var/runtime/bootstrap”

I’m getting this error when invoking myLambda which is using a Docker container:

Init failed error=fork/exec /var/runtime/bootstrap

To fix this, add a step to make the bootstrap file executable after you copy into the image:

COPY bootstrap ${LAMBDA_RUNTIME_DIR}
RUN chmod +x ${LAMBDA_RUNTIME_DIR}/bootstrap