Remove Docker incompat from image prune and build tests

Signed-off-by: Austin Vazquez <macedonv@amazon.com>

cmd/nerdctl/builder_build_test.go

@@ -462,7 +462,6 @@ RUN ["cat", "/hello_from_dir2.txt"]`, testutil.CommonImage, filename)
 // https://github.com/docker/buildx/pull/1482
 func TestBuildSourceDateEpoch(t *testing.T) {
 	testutil.RequiresBuild(t)
-	testutil.DockerIncompatible(t) // Needs buildx v0.10 (https://github.com/docker/buildx/pull/1489)
 	base := testutil.NewBase(t)
 	imageName := testutil.Identifier(t)
 	defer base.Cmd("rmi", imageName).AssertOK()

cmd/nerdctl/image_prune_test.go

@@ -102,10 +102,10 @@ func TestImagePruneFilterUntil(t *testing.T) {
 	testutil.RequiresBuild(t)
 	testutil.RegisterBuildCacheCleanup(t)
 
-	// Docker image's created timestamp is set based on base image creation time.
-	testutil.DockerIncompatible(t)
-
 	base := testutil.NewBase(t)
+	// For deterministically testing the filter, set the image's created timestamp to 2 hours in the past.
+	base.Env = append(base.Env, fmt.Sprintf("SOURCE_DATE_EPOCH=%d", time.Now().Add(-2*time.Hour).Unix()))
+
 	imageName := testutil.Identifier(t)
 	teardown := func() {
 		// Image should have been pruned; but cleanup on failure.