feat: update to alpine v3.15.1

Makefile

@@ -1,8 +1,10 @@
-BUILDER ?= v3.15.0
+BUILDER ?= v3.15.1-4
-RELEASE := v1.21
+RELEASE := v3.15
 
 .PHONY: builder aports_update
 
+all: build
+
 packages:
 	mkdir -p packages
 distfiles:
@@ -15,7 +17,7 @@ aports_update: aports
 	GIT_DIR=aports/.git git pull origin master
 
 # Mounts release into /work of the builder container to build all
-build: packages distfiles
+build: packages distfiles aports_update
 	podman run -ti --rm \
 		-v ${PWD}/distfiles:/var/cache/distfiles \
 		-v ${PWD}/packages:/home/alpine/packages \