fix: update npm in production images to resolve crossspawn vuln

Author: jonnyowenpowell

Dockerfile

@@ -30,6 +30,8 @@ RUN apk update
 RUN apk upgrade
 RUN apk --no-cache add dumb-init skopeo curl bash python3
 
+RUN npm install -g [email protected]
+
 RUN addgroup -S -g 10001 snyk
 RUN adduser -S -G snyk -h /srv/app -u 10001 snyk