feat: add dist to create release for lectures

Author: 1995parham

Makefile

@@ -1,9 +1,14 @@
 lectures := $(shell find -type d -name 'lecture-*')
 
-.PHONY = clean
+.PHONY = clean dist
 
 all: $(lectures:%=%/main.pdf)
 
+dist: $(lectures:%=%/main.pdf)
+	$(foreach lecture,$(lectures:%=%),cp $(lecture)/main.pdf $(lecture).pdf;)
+	tar cvfz lectures.tar.gz $(lectures:%=%.pdf)
+	rm $(lectures:%=%.pdf)
+
 $(lectures:%=%/main.pdf): $(lectures:%=%/main.tex)
 	@echo "building $@"
 	cd $(dir $@) && latexmk