а если вот это убрать? или ls -al сделать вместе с ней
#12 [build 8/9] RUN ls -al && ./gradlew clean build -x test
#12 0.512 total 84
#12 0.512 drwxr-xr-x 1 root root 4096 Apr 27 07:35 .
#12 0.512 drwxr-xr-x 1 root root 4096 Apr 26 13:11 ..
#12 0.512 -rwxr-xr-x 1 root root 501 Apr 15 14:43 .editorconfig
#12 0.512 drwxr-xr-x 8 root root 4096 Apr 27 07:34 .git
#12 0.512 -rwxr-xr-x 1 root root 3563 Apr 15 14:43 .gitattributes
#12 0.512 -rwxr-xr-x 1 root root 2117 Apr 15 14:43 .gitignore
#12 0.512 drwxr-xr-x 5 root root 4096 Apr 27 06:17 .gradle
#12 0.512 drwxr-xr-x 5 root root 4096 Apr 27 06:14 .idea
#12 0.512 -rwxr-xr-x 1 root root 621 Apr 27 07:35 Dockerfile
#12 0.512 -rwxr-xr-x 1 root root 104 Apr 24 08:43 README.md
#12 0.512 -rwxr-xr-x 1 root root 5488 Apr 27 06:02 build.gradle
#12 0.512 drwxr-xr-x 3 root root 4096 Apr 26 12:03 gradle
#12 0.512 -rwxr-xr-x 1 root root 814 Apr 24 08:52 gradle.properties
#12 0.512 -rwxr-xr-x 1 root root 8741 Apr 15 14:43 gradlew
#12 0.512 -rwxr-xr-x 1 root root 2868 Apr 15 14:43 gradlew.bat
#12 0.512 -rwxr-xr-x 1 root root 34 Apr 24 08:46 settings.gradle
#12 0.512 drwxr-xr-x 3 root root 4096 Apr 15 14:44 src
#12 0.512 /bin/sh: ./gradlew: not found
#12 ERROR: process "/bin/sh -c ls -al && ./gradlew clean build -x test" did not complete successfully: exit code: 127