Make gnome-software work a bit better in a template

Set GIO_USE_NETWORK_MONITOR=base variable to avoid gnome-software
refusing any actual action just because it thinks online repositories
are unreachable (they are, via updates proxy).

This doesn't solve all the issues, but at least makes it possible to
install applications.

QubesOS/qubes-issues#6310

debian/qubes-core-agent.install

@@ -132,6 +132,7 @@ usr/bin/qvm-open-in-vm
 usr/bin/qvm-run-vm
 usr/bin/qvm-connect-tcp
 usr/bin/qvm-sync-clock
+usr/lib/environment.d/60-gnome-software-fix.conf
 usr/lib/python3/dist-packages/qubesagent-*.egg-info/*
 usr/lib/python3/dist-packages/qubesagent/*
 usr/lib/qubes-bind-dirs.d/30_cron.conf

package-managers/Makefile

@@ -50,6 +50,8 @@ install:
 	install -d -m 2775 $(DESTDIR)$(QUBESSTATEDIR)/dom0-updates
 	install -D -m 0644 dnf-plugin-downloadurl.py \
 		$(DESTDIR)$(QUBESLIBDIR)/dnf-plugins/downloadurl.py
+	install -D -m 0644 gnome-software-fix.conf \
+		$(DESTDIR)/usr/lib/environment.d/60-gnome-software-fix.conf
 
 install-apt:
 	install -d $(DESTDIR)$(APTCONFDIR)/sources.list.d

package-managers/gnome-software-fix.conf

@@ -0,0 +1 @@
+GIO_USE_NETWORK_MONITOR=base

rpm_spec/core-agent.spec.in

@@ -925,6 +925,7 @@ rm -f %{name}-%{version}
 /usr/lib/qubes/set-default-text-editor
 /usr/lib/qubes/tinyproxy-wrapper
 /usr/lib/dracut/dracut.conf.d/30-qubes.conf
+/usr/lib/environment.d/60-gnome-software-fix.conf
 %dir /usr/lib/qubes/init
 /usr/lib/qubes/init/bind-dirs.sh
 /usr/lib/qubes/init/control-printer-icon.sh