Avoid confusing error when passing in '--version X.Y.Z'

fixes #11578

Signed-off-by: Justin Wood <jwood@starry.com>

scripts/get

@@ -207,6 +207,10 @@ while [[ $# -gt 0 ]]; do
        shift
        if [[ $# -ne 0 ]]; then
            export DESIRED_VERSION="${1}"
+           if [[ "$1" != "v"* ]]; then
+               echo "Expected version arg ('${DESIRED_VERSION}') to begin with 'v', fixing..."
+               export DESIRED_VERSION="v${1}"
+           fi
        else
            echo -e "Please provide the desired version. e.g. --version v2.4.0 or -v latest"
            exit 0

scripts/get-helm-3

@@ -299,6 +299,10 @@ while [[ $# -gt 0 ]]; do
        shift
        if [[ $# -ne 0 ]]; then
            export DESIRED_VERSION="${1}"
+           if [[ "$1" != "v"* ]]; then
+               echo "Expected version arg ('${DESIRED_VERSION}') to begin with 'v', fixing..."
+               export DESIRED_VERSION="v${1}"
+           fi
        else
            echo -e "Please provide the desired version. e.g. --version v3.0.0 or -v canary"
            exit 0