stages/ostree.pull: add remote parameter

Add an optional `remote` parameter that can be used to specify the
the remote to track for the pulled commits.

stages/org.osbuild.ostree.pull

@@ -26,6 +26,10 @@ SCHEMA_2 = """
     "repo": {
       "description": "Location of the OSTree repo.",
       "type": "string"
+    },
+    "remote": {
+      "description": "Add the 'remote' to the ref spec",
+      "type": "string"
     }
   }
 },
@@ -65,12 +69,18 @@ def parse_input(inputs):
 def main(tree, inputs, options):
     source_repo, commits = parse_input(inputs)
     repo = options["repo"]
+    remote = options.get("remote")
     target = os.path.join(tree, repo.lstrip("/"))
 
     for commit, data in commits.items():
         ref = data.get("ref", commit)
 
+        extra_args = []
+        if remote:
+            extra_args.append(f'--remote={remote}')
+
         ostree("pull-local", source_repo, ref,
+               *extra_args,
                repo=target)
 
 

test/data/manifests/fedora-ostree-image.json

@@ -813,7 +813,8 @@
         {
           "type": "org.osbuild.ostree.pull",
           "options": {
-            "repo": "/ostree/repo"
+            "repo": "/ostree/repo",
+            "remote": "osbuild"
           },
           "inputs": {
             "commits": {

test/data/manifests/fedora-ostree-image.mpp.json

@@ -253,7 +253,8 @@
         {
           "type": "org.osbuild.ostree.pull",
           "options": {
-            "repo": "/ostree/repo"
+            "repo": "/ostree/repo",
+            "remote": "osbuild"
           },
           "inputs": {
             "commits": {