Merge pull request andyshinn#24 from acj/alpine-3.13

Bump Alpine to 3.13

Author: andyshinn

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.12
+FROM alpine:3.13
 RUN apk --no-cache add alpine-sdk coreutils cmake sudo \
   && adduser -G abuild -g "Alpine Package Builder" -s /bin/ash -D builder \
   && echo "builder ALL=(ALL) NOPASSWD:ALL" >> /etc/sudoers \

README.md

@@ -17,6 +17,7 @@ We tag each release with a simple `v#` version scheme. Here are the tags to choo
 * `andyshinn/alpine-abuild:v9`: based on Alpine 3.10
 * `andyshinn/alpine-abuild:v10`: based on Alpine 3.11
 * `andyshinn/alpine-abuild:v11`: based on Alpine 3.12
+* `andyshinn/alpine-abuild:v12`: based on Alpine 3.13
 * `andyshinn/alpine-abuild:edge`: based on Alpine edge (includes testing repository as well)
 
 The builder is typically run from your Alpine Linux package source directory (changing `~/.abuild/mykey.rsa` and `~/.abuild/mykey.rsa.pub` to your packager private and public key locations):