Use env templates

Dockerfile

@@ -1,5 +1,8 @@
 FROM ubuntu
 RUN apt-get -y update && apt-get install -y ca-certificates
+RUN ["mkdir", "/usr/share/eksterd"]
 ADD ./eksterd /usr/local/bin
+ADD ./templates /usr/share/eksterd
 EXPOSE 80
+ENV EKSTER_TEMPLATES "/usr/share/eksterd"
 ENTRYPOINT ["/usr/local/bin/eksterd"]

cmd/eksterd/main.go

@@ -114,7 +114,10 @@ func (h *mainHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 				return
 			}
 
-			t, err := template.ParseFiles("templates/index.html", "templates/settings.html")
+			t, err := template.ParseFiles(
+				os.Getenv("EKSTER_TEMPLATES")+"/templates/index.html",
+				os.Getenv("EKSTER_TEMPLATES")+"/templates/settings.html",
+			)
 
 			var page indexPage
 			page.Session = sess