fix: run apk update during build

Dockerfile

@@ -4,13 +4,9 @@ FROM ${BASE_IMAGE}:${ALPINE_VERSION}
 MAINTAINER "f <f@sutty.nl>"
 
 COPY ./build.sh /usr/local/bin/build
-RUN chmod 755 /usr/local/bin/build
+COPY ./entrypoint.sh /usr/local/bin/entrypoint
 RUN echo "${ALPINE_VERSION}" | cut -d . -f 1,2 | xargs -I {} echo 'https://alpine.sutty.nl/alpine/v{}/sutty' >> /etc/apk/repositories
 RUN wget https://alpine.sutty.nl/alpine/sutty.pub -O /etc/apk/keys/alpine@sutty.nl-5ea884cd.rsa.pub
-# We need to update to the builder has access to installing packages
-RUN apk update
 RUN sed -re "s|https://dl-cdn.alpinelinux.org|http://alpine.proxy|g" -i /etc/apk/repositories
 
-USER builder
-ENTRYPOINT ["/usr/local/bin/build"]
-CMD ["abuild", "-r"]
+ENTRYPOINT ["/usr/local/bin/entrypoint"]

build.sh

@@ -6,5 +6,4 @@ export PATH=/usr/lib/ccache/bin:$PATH
 cd /home/builder/package
 
 abuild checksum
-
-exec $*
+abuild -r

entrypoint.sh

@@ -0,0 +1,5 @@
+#!/bin/sh
+set -e
+
+apk update
+su -c /usr/local/bin/build builder