UNWANTED: Don't assume that (podman manifest push) doesn't modify images

Hypothetically (podman manifest push) should get a --preserve-digest parameter;
but really, if someone is building a new multi-arch image from components,
I think it's a fair game to recompress it.

Even in that case, this is a hack and the test should be fixed to do
whatever it does cleanly.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

test/e2e/manifest_test.go

@@ -424,14 +424,16 @@ add_compression = ["zstd"]`), 0o644)
 		check := SystemExec("sha256sum", files)
 		check.WaitWithDefaultTimeout()
 		Expect(check).Should(ExitCleanly())
-		prefix := "sha256:"
-		Expect(check.OutputToString()).To(
-			And(
-				ContainSubstring(strings.TrimPrefix(imageListAMD64InstanceDigest, prefix)),
-				ContainSubstring(strings.TrimPrefix(imageListPPC64LEInstanceDigest, prefix)),
-				ContainSubstring(strings.TrimPrefix(imageListS390XInstanceDigest, prefix)),
-				ContainSubstring(strings.TrimPrefix(imageListARM64InstanceDigest, prefix)),
-			))
+		if false {
+			prefix := "sha256:"
+			Expect(check.OutputToString()).To(
+				And(
+					ContainSubstring(strings.TrimPrefix(imageListAMD64InstanceDigest, prefix)),
+					ContainSubstring(strings.TrimPrefix(imageListPPC64LEInstanceDigest, prefix)),
+					ContainSubstring(strings.TrimPrefix(imageListS390XInstanceDigest, prefix)),
+					ContainSubstring(strings.TrimPrefix(imageListARM64InstanceDigest, prefix)),
+				))
+		}
 	})
 
 	It("push", func() {
@@ -456,15 +458,16 @@ add_compression = ["zstd"]`), 0o644)
 		check := SystemExec("sha256sum", files)
 		check.WaitWithDefaultTimeout()
 		Expect(check).Should(ExitCleanly())
-
-		prefix := "sha256:"
-		Expect(check.OutputToString()).To(
-			And(
-				ContainSubstring(strings.TrimPrefix(imageListAMD64InstanceDigest, prefix)),
-				ContainSubstring(strings.TrimPrefix(imageListPPC64LEInstanceDigest, prefix)),
-				ContainSubstring(strings.TrimPrefix(imageListS390XInstanceDigest, prefix)),
-				ContainSubstring(strings.TrimPrefix(imageListARM64InstanceDigest, prefix)),
-			))
+		if false {
+			prefix := "sha256:"
+			Expect(check.OutputToString()).To(
+				And(
+					ContainSubstring(strings.TrimPrefix(imageListAMD64InstanceDigest, prefix)),
+					ContainSubstring(strings.TrimPrefix(imageListPPC64LEInstanceDigest, prefix)),
+					ContainSubstring(strings.TrimPrefix(imageListS390XInstanceDigest, prefix)),
+					ContainSubstring(strings.TrimPrefix(imageListARM64InstanceDigest, prefix)),
+				))
+		}
 	})
 
 	It("push with compression-format and compression-level", func() {