fix(doc): Ensure graphviz is installed (#510)

Author: elementbound

.github/workflows/site.yml

@@ -32,6 +32,8 @@ jobs:
         run: pip install mkdocs && pip install $(mkdocs get-deps) && pip install mkdocs-material
       - name: Setup mike
         run: pip install mike
+      - name: Setup graphviz
+        run: sudo apt install graphviz
       - name: Start PlantUML server
         run: sh/setup-plantuml.sh
       - name: Build

sh/setup-plantuml.sh

@@ -1,12 +1,19 @@
 source sh/shared.sh
 
-if ! java -v; then
+if ! which java > /dev/null; then
   print "Java not found!"
+  exit 1;
 fi;
 
+java -version
+
 print "Downloading plantuml"
 curl -LO https://github.com/plantuml/plantuml/releases/download/v1.2025.4/plantuml-mit-1.2025.4.jar
 
 print "Starting server"
 java -jar ./plantuml-mit-1.2025.4.jar -picoweb:8080:127.0.0.1 &
-echo $!
+if [ $? -ne 0 ]; then
+  print "Server failed!"
+else
+  print "Server PID:" $!
+fi