Update Dockerfile

Dockerfile

@@ -1,6 +1,6 @@
-FROM node:13-alpine
+FROM node:14-alpine
 RUN apk update && apk upgrade && \
     apk add --no-cache bash git openssh
 COPY entrypoint.sh /entrypoint.sh
 COPY lib/actions/checkout/index.js /checkout.js
-ENTRYPOINT ["/entrypoint.sh"]
+ENTRYPOINT ["/entrypoint.sh"]