Reflect the latest registry changes in openapi.yaml (#345)

<!-- Provide a brief summary of your changes -->

## Motivation and Context
<!-- Why is this change needed? What problem does it solve? -->
The following PR:
* Adds a new `transport` type used in Package and Remotes
* Added `docker` to the `runtime_hint` examples
* Added support for templated URLs. It is available for streamable-http
and sse transports for Packages. I didn't thought of reasons to have
this for Remotes, but we can enable it if needed.
* Added validation for templated URLs so we can ensure all referenced
placeholder variables are available.
* For streamable-http and SSE transport types the URL is now a required
property
* Updated the publisher init command to reflect these changes
* Updated the seed.json file
* Added unit tests for the transport type related changes
* Updated the server.json schema and the external pkg structs to reflect
the new transport type
* Updated the examples

Thanks to @kkkarthik for spotting it! 🙏 

## How Has This Been Tested?
<!-- Have you tested this in a real application? Which scenarios were
tested? -->
Ran the tests locally

## Breaking Changes
<!-- Will users need to update their code or configurations? -->
Yes

## Types of changes
<!-- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [x] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [ ] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [ ] My code follows the repository's style guidelines
- [ ] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

## Additional context
<!-- Add any other context, implementation notes, or design decisions
-->

---------

Signed-off-by: Radoslav Dimitrov <radoslav@stacklok.com>

internal/api/handlers/v0/publish_integration_test.go

@@ -234,6 +234,9 @@ func TestPublishIntegration(t *testing.T) {
 					RegistryType: model.RegistryTypeMCPB,
 					Identifier:   "github.com/domdomegg/airtable-mcp-server/releases/download/v1.7.2/airtable-mcp-server.mcpb",
 					Version:      "1.7.2",
+					Transport: model.Transport{
+						Type: model.TransportTypeStdio,
+					},
 				},
 			},
 		}

internal/api/handlers/v0/publish_registry_validation_test.go

@@ -55,6 +55,9 @@ func TestPublishRegistryValidation(t *testing.T) {
 					RegistryType: model.RegistryTypeNPM,
 					Identifier:   "nonexistent-npm-package-xyz123",
 					Version:      "1.0.0",
+					Transport: model.Transport{
+						Type: model.TransportTypeStdio,
+					},
 				},
 			},
 		}
@@ -95,6 +98,9 @@ func TestPublishRegistryValidation(t *testing.T) {
 					RegistryType: model.RegistryTypeMCPB,
 					Identifier:   "https://github.com/microsoft/playwright-mcp/releases/download/v0.0.36/playwright-mcp-extension-v0.0.36.zip",
 					Version:      "0.0.36",
+					Transport: model.Transport{
+						Type: model.TransportTypeStdio,
+					},
 				},
 			},
 		}
@@ -143,11 +149,17 @@ func TestPublishRegistryValidation(t *testing.T) {
 					RegistryType: model.RegistryTypeMCPB,
 					Identifier:   "https://github.com/microsoft/playwright-mcp/releases/download/v0.0.36/playwright-mcp-extension-v0.0.36.zip",
 					Version:      "1.0.0",
+					Transport: model.Transport{
+						Type: model.TransportTypeStdio,
+					},
 				},
 				{
 					RegistryType: model.RegistryTypeNPM,
 					Identifier:   "nonexistent-second-package-abc123",
 					Version:      "1.0.0",
+					Transport: model.Transport{
+						Type: model.TransportTypeStdio,
+					},
 				},
 			},
 		}
@@ -189,11 +201,17 @@ func TestPublishRegistryValidation(t *testing.T) {
 					RegistryType: model.RegistryTypeNPM,
 					Identifier:   "nonexistent-first-package-xyz789",
 					Version:      "1.0.0",
+					Transport: model.Transport{
+						Type: model.TransportTypeStdio,
+					},
 				},
 				{
 					RegistryType: model.RegistryTypeMCPB,
 					Identifier:   "https://github.com/microsoft/playwright-mcp/releases/download/v0.0.36/playwright-mcp-extension-v0.0.36.zip",
 					Version:      "1.0.0",
+					Transport: model.Transport{
+						Type: model.TransportTypeStdio,
+					},
 				},
 			},
 		}

internal/api/handlers/v0/publish_test.go

@@ -222,6 +222,9 @@ func TestPublishEndpoint(t *testing.T) {
 						RegistryType: model.RegistryTypeMCPB,
 						Identifier:   "https://github.com/example/server/releases/download/v1.0.0/server.tar.gz",
 						Version:      "1.0.0",
+						Transport: model.Transport{
+							Type: model.TransportTypeStdio,
+						},
 					},
 				},
 			},