Add way to override command in cli help message (#742)

Author: Chicken

Dockerfile

@@ -2,6 +2,8 @@ FROM eclipse-temurin:21-jre-jammy
 
 WORKDIR /app
 
+ENV BLUEMAP_COMMAND="docker run --rm -it ghcr.io/bluemap-minecraft/bluemap"
+
 COPY build/release/*-cli.jar cli.jar
 
 ENTRYPOINT [ "java", "-jar", "cli.jar" ]

implementations/cli/src/main/java/de/bluecolored/bluemap/cli/BlueMapCLI.java

@@ -546,6 +546,10 @@ private static void printHelp() {
     private static String getCliCommand() {
         String filename = "bluemap-cli.jar";
         try {
+            if (System.getenv("BLUEMAP_COMMAND") != null) {
+                return System.getenv("BLUEMAP_COMMAND");
+            }
+
             Path file = Path.of(BlueMapCLI.class.getProtectionDomain()
                     .getCodeSource()
                     .getLocation()