.github/workflows: add script to check that packages can still be

installed.

This will allow us to confirm the repository's staging state in CI.

common/travis/check-install.sh

@@ -0,0 +1,28 @@
+#!/bin/sh
+#
+# check-install.sh
+
+export XBPS_TARGET_ARCH="$2" XBPS_DISTDIR=/hostrepo
+
+if [ "$1" != "$XBPS_TARGET_ARCH" ]; then
+	triplet="$(/hostrepo/xbps-src -a "$XBPS_TARGET_ARCH" show-var XBPS_CROSS_TRIPLET)"
+	ROOTDIR="-r /usr/$triplet"
+fi
+
+ADDREPO="--repository=$HOME/hostdir/binpkgs --repository=$HOME/hostdir/binpkgs/nonfree"
+
+while read -r pkg; do
+	for subpkg in $(xsubpkg $pkg); do
+		/bin/echo -e "\x1b[32mTrying to install dependants of $subpkg:\x1b[0m"
+		for dep in $(xbps-query $ADDREPO -RX "$subpkg"); do
+			xbps-install \
+				$ROOTDIR $ADDREPO \
+				-Sny \
+				"$subpkg" "$(xbps-uhelper getpkgname "$dep")"
+			if [ $? -eq 8 ]; then
+				/bin/echo -e "\x1b[31mFailed to install '$subpkg' and '$dep'\x1b[0m"
+				exit 1
+			fi
+		done
+	done
+done < /tmp/templates