update: makefile and vscode latex recipy

Makefile

@@ -1,7 +1,8 @@
 main = report
 latexmk = latexmk -pdflatex
+git_add_files = *.tex imgs/ ref.bib
 
-.PHONY : main clean cleanall
+.PHONY : main clean cleanall autopush
 
 main: $(main).tex
 	$(latexmk) $<
@@ -11,3 +12,7 @@ clean:
 
 cleanall:
 	$(latexmk) -C $(main).tex
+
+autopush: main
+	git add $(git_add_files)
+	git diff --cached --quiet || (git commit -m "update: auto commit" && git push)