workflows: fetch xbps for lint step

.github/workflows/build.yaml

@@ -19,6 +19,7 @@ jobs:
           fetch-depth: 200
       - run: common/travis/fetch_upstream.sh
       - run: common/travis/changed_templates.sh
+      - run: common/travis/fetch-xbps.sh
       - run: common/travis/fetch-xtools.sh
       - run: common/travis/xlint.sh
       # GitHub Action create a merge commit, ignore it

common/travis/fetch-xbps.sh

@@ -0,0 +1,22 @@
+#!/bin/sh
+#
+# fetch-xbps.sh
+
+command -v xbps-uhelper >/dev/null && exit
+TAR=tar
+command -v bsdtar >/dev/null && TAR=bsdtar
+ARCH=$(uname -m)-musl
+VERSION=0.59_5
+URL="https://alpha.de.repo.voidlinux.org/static/xbps-static-static-${VERSION}.${ARCH}.tar.xz"
+FILE=${URL##*/}
+
+mkdir -p /tmp/bin
+
+/bin/echo -e '\x1b[32mInstalling xbps...\x1b[0m'
+if command -v wget >/dev/null; then
+	wget -q -O "$FILE" "$URL" || exit 1
+else
+	curl -s -o "$FILE" "$URL" || exit 1
+fi
+
+$TAR xf "$FILE" -C /tmp/bin --strip-components=3 ./usr/bin || exit 1