upgrade alpine base image v3.12->3.13.1 including bitcoin core package upgrade v0.19.1-r0->v0.20.1-r1

Dockerfile

@@ -1,8 +1,8 @@
-FROM alpine:3.12
+FROM alpine:3.13.1
 
 # > All command-line options (except for '-datadir' and '-conf') may be specified in a configuration file
 ENV DATA_DIR_PATH=/var/lib/bitcoin
-ARG BITCOIN_CORE_PACKAGE_VERSION=0.19.1-r0
+ARG BITCOIN_CORE_PACKAGE_VERSION=0.20.1-r1
 # > Executing bitcoin-0.19.1-r0.post-install
 # > Generated random user / password / port in: /etc/bitcoin.conf
 RUN apk add --no-cache \