the last version not working. missed value for `ARG AWS_IAM_AUTH_VERSION_URL` about k8s HOT 7 CLOSED

# aws-iam-authenticator latest
iam_auth=$(curl -s https://docs.aws.amazon.com/eks/latest/userguide/install-aws-iam-authenticator.html|grep iam-auth |grep linux|head -1)
iam_auth_url=$(echo ${iam_auth} |grep -oP '(?<=curl -o aws-iam-authenticator )[^<]*'|head -1)

build --no-cache ...... --build-arg AWS_IAM_AUTH_VERSION_URL="${iam_auth_url}" -t ${image}:${tag} .

$ docker run -ti --rm alpine/k8s:1.13.12 aws-iam-authenticator version
{"Version":"v0.5.0","Commit":"1cfe2a90f68381eacd7b6dcfa2bf689e76eb8b4b"}

Step 9/13 : RUN curl -LO ${AWS_IAM_AUTH_VERSION_URL} &&     mv aws-iam-authenticator /usr/bin/aws-iam-authenticator &&     chmod +x /usr/bin/aws-iam-authenticator
 ---> Running in cabcb827ec9c
curl: no URL specified!
curl: try 'curl --help' or 'curl --manual' for more information
The command '/bin/sh -c curl -LO ${AWS_IAM_AUTH_VERSION_URL} &&     mv aws-iam-authenticator /usr/bin/aws-iam-authenticator &&     chmod +x /usr/bin/aws-iam-authenticator' returned a non-zero code: 2```

env:
  - tag=1.18.2
  - tag=1.17.5
  - tag=1.16.8
  - tag=1.15.11
  - tag=1.14.9
  - tag=1.13.12

script:
  - bash ./build.sh

export tag=1.13.12

bash ./build.sh