Make `buildah manifest push --all` true by default

Changed the `--all` option of `buildah manifest push` to be true by
default. This matches the behavior of the equivalent Podman option
(`podman manifest push --all`), making it easier to switch between
Podman and Buildah.

Updated buildah.manifest.push.1 docs to reflect this change.

Added test "manifest-push-all-default-true" to `tests/lists.bats`.

Closes: #5547
Signed-off-by: Paul Nettleton <k9@k9withabone.dev>

cmd/buildah/manifest.go

@@ -246,7 +246,7 @@ func init() {
 	manifestPushCommand.SetUsageTemplate(UsageTemplate())
 	flags = manifestPushCommand.Flags()
 	flags.BoolVar(&manifestPushOpts.rm, "rm", false, "remove the manifest list if push succeeds")
-	flags.BoolVar(&manifestPushOpts.all, "all", false, "also push the images in the list")
+	flags.BoolVar(&manifestPushOpts.all, "all", true, "also push the images in the list")
 	flags.StringVar(&manifestPushOpts.authfile, "authfile", auth.GetDefaultAuthFile(), "path of the authentication file. Use REGISTRY_AUTH_FILE environment variable to override")
 	flags.StringVar(&manifestPushOpts.certDir, "cert-dir", "", "use certificates at the specified path to access the registry")
 	flags.StringVar(&manifestPushOpts.creds, "creds", "", "use `[username[:password]]` for accessing the registry")

docs/buildah-manifest-push.1.md

@@ -30,7 +30,7 @@ original instance.
 **--all**
 
 Push the images mentioned in the manifest list or image index, in addition to
-the list or index itself.
+the list or index itself. (Default true)
 
 **--authfile** *path*
 

tests/lists.bats

@@ -226,6 +226,11 @@ IMAGE_LIST_S390X_INSTANCE_DIGEST=sha256:882a20ee0df7399a445285361d38b711c299ca09
     expect_output --substring ${IMAGE_LIST_S390X_INSTANCE_DIGEST##sha256:}
 }
 
+@test "manifest-push-all-default-true" {
+    run_buildah manifest push --help
+    expect_output --substring "all.*\(default true\).*authfile"
+}
+
 @test "manifest-push-purge" {
     run_buildah manifest create foo
     run_buildah manifest add --arch=arm64 foo ${IMAGE_LIST}