use jdk11 for docker build

Makefile

@@ -1,10 +1,11 @@
 
 TAG=registry.rudin.io/x86/minetest-tileserver
 VOLUMES=-v maven-repo:/root/.m2 -v $(shell pwd)/src:/src -v $(shell pwd)/pom.xml:/pom.xml -v $(shell pwd)/target/docker:/target
+MAVEN_TAG=maven:3.6-jdk-11
 
 build:
 	rm -rf target/docker
-	docker run -it --rm $(VOLUMES) maven:3.5-jdk-10 mvn install
+	docker run -it --rm $(VOLUMES) -e M3_HOME=/root/.m2 $(MAVEN_TAG) mvn install
 	docker build . -t $(TAG)
 
 push:

pom.xml

@@ -167,6 +167,12 @@
 			<version>3.5.2</version>
 		</dependency>
 
+		<dependency>
+			<groupId>javax.annotation</groupId>
+			<artifactId>javax.annotation-api</artifactId>
+			<version>1.2</version>
+		</dependency>
+
 		<!-- Testing -->
 		<dependency>
 			<groupId>com.h2database</groupId>