upgrade alpine base image v3.12.3->v3.13.0 including upgrade of dovecot v2.3.11.3-r1->v2.3.13-r0 (diff links below, fixes CVE-2020-24386 & CVE-2020-25275)

https://github.com/dovecot/core/releases/tag/2.3.13
https://git.alpinelinux.org/aports/commit/main/dovecot?id=579394558547f8f589ab5cdca6b9cb32d6955d47

http://www.dest-unreach.org/socat/doc/CHANGES
https://git.alpinelinux.org/aports/commit/main/socat?id=ce7cee2fb4112ebf10c839b6187420c8f64ad214
https://git.alpinelinux.org/aports/commit/main/socat?id=368c6047bc2890190f47922b56d626279f24f5f1

Dockerfile

@@ -1,7 +1,7 @@
-FROM alpine:3.12.3
+FROM alpine:3.13.0
 
-ARG DOVECOT_PACKAGE_VERSION=2.3.11.3-r1
-ARG SOCAT_PACKAGE_VERSION=1.7.3.4-r0
+ARG DOVECOT_PACKAGE_VERSION=2.3.13-r0
+ARG SOCAT_PACKAGE_VERSION=1.7.4.1-r0
 RUN apk add --no-cache \
         dovecot-lmtpd=$DOVECOT_PACKAGE_VERSION \
         dovecot-pigeonhole-plugin=$DOVECOT_PACKAGE_VERSION \

dovecot-packages-log.url

@@ -0,0 +1 @@
+https://git.alpinelinux.org/aports/log/main/dovecot

socat-package-log.url

@@ -0,0 +1 @@
+https://git.alpinelinux.org/aports/log/main/socat