limit allowed pkg_managers

CAchito and cachi2 should support the same set of pkg managers.

Cachi2 allows more pkg managers, but those must be tested and
implemented in OSBS as they may interact with existing workflows.

Signed-off-by: Martin Basti <mbasti@redhat.com>

osbs/schemas/container.json

@@ -348,6 +348,7 @@
           "type": ["array", "null"],
           "items": {
               "type": "string",
+              "enum": ["gomod", "rubygems", "pip", "yarn", "npm", "git-submodule"],
               "examples": [
                 "gomod"
               ]

tests/utils/test_yaml.py

@@ -360,3 +360,43 @@ def test_invalid_remote_sources_schema(config, err_message, caplog):
 def test_valid_remote_sources_schema(config, expected_data):
     data = read_yaml(dedent(config), "schemas/container.json")
     assert expected_data == data
+
+
+@pytest.mark.parametrize("pkg_manager,valid", [
+    ("npm", True),
+    ("pip", True),
+    ("gomod", True),
+    ("git-submodule", True),
+    ("yarn", True),
+    ("rubygems", True),
+    ("generic", False),
+    ("rpm", False),
+])
+def test_valid_pkg_managers(pkg_manager, valid):
+    remote_sources = f"""
+        remote_sources:
+        - name: valid-name
+          remote_source:
+            repo: https://git.example.com/team/repo.git
+            ref: b55c00f45ec3dfee0c766cea3d395d6e21cc2e5a
+            pkg_managers:
+                - {pkg_manager}
+        """
+    if valid:
+        assert read_yaml(dedent(remote_sources), "schemas/container.json")
+    else:
+        with pytest.raises(OsbsValidationException):
+            read_yaml(dedent(remote_sources), "schemas/container.json")
+
+    remote_source = f"""
+        remote_source:
+          repo: https://git.example.com/team/repo.git
+          ref: b55c00f45ec3dfee0c766cea3d395d6e21cc2e5a
+          pkg_managers:
+            - {pkg_manager}
+    """
+    if valid:
+        read_yaml(dedent(remote_source), "schemas/container.json")
+    else:
+        with pytest.raises(OsbsValidationException):
+            read_yaml(dedent(remote_source), "schemas/container.json")