fix: stderr of executed docker command ignored again

Author: augi

src/main/groovy/com/avast/gradle/dockercompose/DockerExecutor.groovy

@@ -29,7 +29,6 @@ class DockerExecutor {
                 def finalArgs = [settings.dockerExecutable.get()]
                 finalArgs.addAll(args)
                 e.commandLine finalArgs
-                e.errorOutput = os
                 e.standardOutput = os
                 e.ignoreExitValue = true
             }

src/test/groovy/com/avast/gradle/dockercompose/Fixture.groovy

@@ -14,7 +14,7 @@ class Fixture implements AutoCloseable {
             services:
                 web:
                     image: nginx:stable
-                    command: bash -c "sleep 5 && nginx -g 'daemon off;'"
+                    command: bash -c " echo 'starting nginx' && sleep 5 && nginx -g 'daemon off;'"
                     ports:
                       - 80
         ''')