Add i-d-template make target, rename build

.github/workflows/editor.yml

@@ -23,7 +23,7 @@ permissions:
 
 jobs:
   build:
-    name: Update Editor’s Copy
+    name: Editor’s Copy
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3

Makefile

@@ -1,3 +1,15 @@
+LIBDIR := lib
+include $(LIBDIR)/main.mk
+
+$(LIBDIR)/main.mk:
+ifneq (,$(shell grep "path *= *$(LIBDIR)" .gitmodules 2>/dev/null))
+	git submodule sync
+	git submodule update $(CLONE_ARGS) --init
+else
+	git clone -q --depth 10 $(CLONE_ARGS) \
+	    -b main https://github.com/martinthomson/i-d-template $(LIBDIR)
+endif
+
 pdf:
 	mkdir -p build
 	cp -r media build