[docker] Dockerfile if else condition with external arguments

Using Bash script and Alpine/Centos

Dockerfile

FROM alpine  #just change this to centos 

ARG MYARG=""
ENV E_MYARG=$MYARG

ADD . /tmp
RUN chmod +x /tmp/script.sh && /tmp/script.sh

script.sh

#!/usr/bin/env sh

if [ -z "$E_MYARG" ]; then
    echo "NO PARAM PASSED"
else
    echo $E_MYARG
fi

Passing arg: docker build -t test --build-arg MYARG="this is a test" .

....
Step 5/5 : RUN chmod +x /tmp/script.sh && /tmp/script.sh
 ---> Running in 10b0e07e33fc
this is a test
Removing intermediate container 10b0e07e33fc
 ---> f6f085ffb284
Successfully built f6f085ffb284

Without arg: docker build -t test .

....
Step 5/5 : RUN chmod +x /tmp/script.sh && /tmp/script.sh
 ---> Running in b89210b0cac0
NO PARAM PASSED
Removing intermediate container b89210b0cac0
....

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