e2e: add docker v29-rc

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.github/workflows/e2e.yml

@@ -37,6 +37,7 @@ jobs:
           - alpine
           - debian
         engine-version:
+          - 29-rc  # latest rc
           - 28  # latest
           - 27  # latest - 1
           - 25  # mirantis lts

e2e/image/push_test.go

@@ -3,6 +3,8 @@ package image
 import (
 	"testing"
 
+	"gotest.tools/v3/assert"
+	is "gotest.tools/v3/assert/cmp"
 	"gotest.tools/v3/icmd"
 )
 
@@ -10,6 +12,7 @@ func TestPushQuietErrors(t *testing.T) {
 	result := icmd.RunCmd(icmd.Command("docker", "push", "--quiet", "nosuchimage"))
 	result.Assert(t, icmd.Expected{
 		ExitCode: 1,
-		Err:      "An image does not exist locally with the tag: nosuchimage",
 	})
+	assert.Check(t, is.Contains(result.Stderr(), "does not exist"))
+	assert.Check(t, is.Contains(result.Stderr(), "nosuchimage"))
 }