"quarkus image build" fails for the gRPC quarkus project; works after mvnw is run

[bentito]

Hi,
For me, following similar path to Ionannis' great Quarkus CLI demo, but trying with the gRPC project. I got the following:

after pushing to github this:

$ git clone https://github.com/bentito/code-with-quarkus.git
$ quarkus image build

ends with errors:

[INFO] Compiling 1 source file to /Users/btofel/workspace/quarkus_scratch/code-with-quarkus/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] /Users/btofel/workspace/quarkus_scratch/code-with-quarkus/src/main/java/org/acme/HelloGrpcService.java:[8,42] cannot find symbol
  symbol: class HelloGrpc
[ERROR] /Users/btofel/workspace/quarkus_scratch/code-with-quarkus/src/main/java/org/acme/HelloGrpcService.java:[11,37] cannot find symbol
  symbol:   class HelloRequest
  location: class org.acme.HelloGrpcService
[ERROR] /Users/btofel/workspace/quarkus_scratch/code-with-quarkus/src/main/java/org/acme/HelloGrpcService.java:[11,16] cannot find symbol
  symbol:   class HelloReply
  location: class org.acme.HelloGrpcService
[ERROR] /Users/btofel/workspace/quarkus_scratch/code-with-quarkus/src/main/java/org/acme/HelloGrpcService.java:[10,5] method does not override or implement a method from a supertype
[ERROR] /Users/btofel/workspace/quarkus_scratch/code-with-quarkus/src/main/java/org/acme/HelloGrpcService.java:[13,29] cannot find symbol
  symbol:   variable HelloReply
  location: class org.acme.HelloGrpcService
[INFO] 5 errors
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE

after running:

$ ./mvnw compile quarkus:dev

then quarkus build image runs without error.
Thanks,
Brett

[quarkus-bot[bot]]

/cc @alesj(grpc), @cescoffier(grpc)