Erro ao rodar imagem --- Error: Unable to access jarfile /app.jar

Olá pessoal! Estou tentando rodar a imagem mas está apresentando esse erro:

C:\Users\rapha\eclipse-workspace\_ALURA_CURSO_SPRINGBOOT - 7\forum - Módulo 12> docker build -t alura/forum .
[+] Building 2.3s (7/7) FINISHED
 => [internal] load .dockerignore                                                                                                                                                                                     0.1s
 => => transferring context: 2B                                                                                                                                                                                       0.0s
 => [internal] load build definition from Dockerfile                                                                                                                                                                  0.1s
 => => transferring dockerfile: 154B                                                                                                                                                                                  0.0s
 => [internal] load metadata for docker.io/library/openjdk:8-jdk-alpine                                                                                                                                               2.0s
 => [internal] load build context                                                                                                                                                                                     0.1s
 => => transferring context: 28B                                                                                                                                                                                      0.0s
 => CACHED [1/2] FROM docker.io/library/openjdk:8-jdk-alpine@sha256:94792824df2df33402f201713f932b58cb9de94a0cd524164a0f2283343547b3                                                                                  0.0s
 => [2/2] COPY target/*.jar app.jar                                                                                                                                                                                   0.0s
 => exporting to image                                                                                                                                                                                                0.1s
 => => exporting layers                                                                                                                                                                                               0.1s
 => => writing image sha256:85b5d33a85202722a28ee871d3175e826852f02a938638b945cdcb2bb0c6076c                                                                                                                          0.0s
 => => naming to docker.io/alura/forum                                                                                                                                                                                0.0s

C:\Users\rapha\eclipse-workspace\_ALURA_CURSO_SPRINGBOOT - 7\forum - Módulo 12>docker run -p 8080:8080 -e SPRING_PROFILES_ACTIVE='prod' -e FORUM_DBUSER='raphael' -e FORUM_DBUSERSW='123456' alura/forum
Error: Unable to access jarfile /app.jar