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

Dockerfile

@@ -1,12 +1,12 @@
-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 TTF_OPENSANS_PACKAGE_VERSION=1.10-r0
+ARG BITCOIN_QT_PACKAGE_VERSION=0.20.1-r1
+ARG TTF_OPENSANS_PACKAGE_VERSION=1.10-r1
 ARG USER=bitcoin
 RUN apk add --no-cache \
-        bitcoin-qt=$BITCOIN_CORE_PACKAGE_VERSION \
+        bitcoin-qt=$BITCOIN_QT_PACKAGE_VERSION \
         ttf-opensans=$TTF_OPENSANS_PACKAGE_VERSION \
     && adduser -h "$DATA_DIR_PATH" -u 100 -S $USER
 VOLUME $DATA_DIR_PATH