build from minio mc client docker image

Dockerfile

@@ -1,12 +1,4 @@
-FROM ubuntu:20.04
-
-RUN apt-get update && \
-    apt-get install --assume-yes wget
-
-RUN wget https://dl.min.io/client/mc/release/linux-amd64/mc \
-    && chmod +x mc \
-    && mv mc /usr/local/bin/ \
-    && mc --help
+FROM minio/mc:RELEASE.2020-10-03T02-54-56Z
 
 # Copies your code file from your action repository to the filesystem path `/` of the container
 COPY entrypoint.sh /entrypoint.sh