convert image to node:alpine and shell to ash

[digitaldrummerj]

By using node:alpine for the image instead of node:latest, it reduced the size of the image from 685 megs to 78 megs.

bash is not included with alpine. ash is the included shell in alpine

[kevinjom]

@digitaldrummerj I agree with you we should get the image size as small as possible, good change.

@clue could we get this merged and image published? I am waitting the downloading to complete, so just wanted to raise a PR and I found @digitaldrummerj had done this.