Switch to zulu build since openjdk alpine is outdated, add support for 1.18.1

Author: helightdev

cli/.gitignore

@@ -4,3 +4,7 @@
 
 # Conventional directory for build output.
 build/
+
+# Generated files
+barrel.exe
+barrel

cli/bin/barrel.dart

@@ -15,8 +15,8 @@ import 'startfiles.dart';
 var dio = Dio();
 var uuids = Uuid();
 
-var spigotVersions = ["1.17.1", "1.16.5", "1.12.2", "1.8.8"]; //Common versions
-var javaVersions = ["16", "16", "16", "16"];
+var spigotVersions = ["1.18.1", "1.17.1", "1.16.5", "1.12.2", "1.8.8"]; //Common versions
+var javaVersions =   ["17",     "16",     "16",     "16",     "16"];
 
 var helpMessage =
 """

cli/bin/dockerfile.dart

@@ -1,6 +1,6 @@
 var template =
 """
-FROM openjdk:%JAVA_VERSION%-alpine
+FROM azul/zulu-openjdk-alpine:%JAVA_VERSION%-jre
 LABEL baseimage.author="[email protected]"
 LABEL baseimage.src="https://github.com/hoppermc/Hopper"
 LABEL generated.version="%VERSION%"