ci: Build ostree from git master

To assist https://github.com/flatpak/flatpak/pull/848

ci/build.sh

@@ -13,4 +13,16 @@ pkg_install sudo which attr fuse \
     /usr/bin/{update-mime-database,update-desktop-database,gtk-update-icon-cache}
 pkg_install_if_os fedora gjs parallel clang
 
+# Temporarily build ostree from git master for https://github.com/flatpak/flatpak/pull/848
+(git clone --depth=1 https://github.com/ostreedev/ostree/
+ cd ostree
+ pkg_install_builddeps ostree
+ unset CFLAGS # the sanitizers require calling apps be linked too
+ build
+ make
+ make install
+ ostree --version
+)
+
+
 build --enable-gtk-doc ${CONFIGOPTS:-}