Drone CI has special handling for ${VAR} and will replace it itself instead of letting the shell do it. So if you have export PATH=${GOPATH}/bin:$PATH and have $GOPATH defined in your global environment key, then it’ll become a blank value. But if you do export PATH=$GOPATH/bin:$PATH it’ll work. You can escape by adding an extra dollar sign, i.e. $${VAR} will be evaluated by the shell.

This is different from normal shell where ${VAR} is the same as $VAR and it exists to make sure you can concatenate strings without issues, i.e.

VAR=m000
echo "'${VAR}est'"  # => 'm000est'
echo "'$VARest'"    # => ''