Fix build

.gitlab-ci.yml

 image: blang/latex
 before_script:
-  - apt-get update -qq && apt-get install -y -qq build-essential
+  - apt-get update -qq && apt-get install -y -qq build-essential plantuml
 build:
   script:
     - make
   artifacts:
     paths:
-      - "tipps.pdf"
\ No newline at end of file
+      - "tipps.pdf"

Makefile

@@ -3,7 +3,7 @@ BASE=tipps
 
 default: $(BASE).pdf
 
-$(BUILD)/$(BASE).pdf: $(BASE).tex
+$(BUILD)/$(BASE).pdf: $(BASE).tex example_class_diagram.png
 	mkdir -p $(BUILD)
 	latexmk -f -pdf -outdir=build $<
 
@@ -17,7 +17,7 @@ show: $(BASE).pdf
 	gnome-open $< || open $<
 
 clean:
-	rm -rf build
+	rm -rf build example_class_diagram.png
 
 %.png : %.plantuml
 	plantuml $<