fixup! release: add Mac OSX installer build

Sadly, since 904339e (Introduce support for the Meson build system,
2024-12-06) the `Documentation/asciidoc.conf` file that
`contrib/subtree/` relies on is no longer present by default because it
has to be generated now.

This is yet another other, _other_ change required to accommodate Meson.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

.github/macos-installer/Makefile

@@ -79,6 +79,7 @@ $(BUILD_DIR)/git-$(VERSION)/osx-installed-man: $(BUILD_DIR)/git-$(VERSION)/osx-i
 	touch $@
 
 $(BUILD_DIR)/git-$(VERSION)/osx-built-subtree:
+	$(SUBMAKE) -C $(BUILD_DIR)/git-$(VERSION)/Documentation asciidoc.conf
 	cd $(BUILD_DIR)/git-$(VERSION)/contrib/subtree; $(SUBMAKE) XML_CATALOG_FILES="$(XML_CATALOG_FILES)" all git-subtree.1
 	touch $@