scripts/mkimage: automatically add pubkey from abuild

the boot repositry needs to be signed with a key. We explicitly copy
this to initramfs so users don't need use --hostkeys which requires
access to /etc/apk/keys/

without the key in intramfs the boot repository will be useless

scripts/mkimage.sh

@@ -209,6 +209,14 @@ req_arch=${req_arch:-${default_arch}}
 [ "$req_arch" != "all" ] || req_arch="${all_arch}"
 [ "$req_profiles" != "all" ] || req_profiles="${all_profiles}"
 
+# get abuild pubkey used to sign the apkindex
+# we need inject this to the initramfs or we will not be able to use the
+# boot repository
+if [ -z "$_hostkeys" ]; then
+	_pub=${PACKAGER_PRIVKEY:+${PACKAGER_PRIVKEY}.pub}
+	_abuild_pubkey="${PACKAGER_PUBKEY:-$_pub}"
+fi
+
 # create images
 for ARCH in $req_arch; do
 	APKROOT="$WORKDIR/apkroot-$ARCH"

scripts/mkimg.base.sh

@@ -4,6 +4,7 @@ build_kernel() {
 	local _pkgs="$@"
 	update-kernel \
 		$_hostkeys \
+		${_abuild_pubkey:+--apk-pubkey $_abuild_pubkey} \
 		--media \
 		--flavor "$_flavor" \
 		--arch "$ARCH" \