Fix missing signature key error when pulling Docker images with SERVE_DIRECT enabled (#32365) (#32397)

Backport #32365

Fix #28121

I did some tests and found that the `missing signature key` error is
caused by an incorrect `Content-Type` header. Gitea correctly sets the
`Content-Type` header when serving files.


https://github.com/go-gitea/gitea/blob/348d1d0f322ca57c459acd902f54821d687ca804/routers/api/packages/container/container.go#L712-L717
However, when `SERVE_DIRECT` is enabled, the `Content-Type` header may
be set to an incorrect value by the storage service. To fix this issue,
we can use query parameters to override response header values.

https://docs.aws.amazon.com/AmazonS3/latest/API/API_GetObject.html <img
width="600px"

src="https://github.com/user-attachments/assets/f2ff90f0-f1df-46f9-9680-b8120222c555"
/>

In this PR, I introduced a new parameter to the `URL` method to support
additional parameters.

```
URL(path, name string, reqParams url.Values) (*url.URL, error)
```

routers/api/packages/container/container.go

@@ -715,7 +715,9 @@ func DeleteManifest(ctx *context.Context) {
 }
 
 func serveBlob(ctx *context.Context, pfd *packages_model.PackageFileDescriptor) {
-	s, u, _, err := packages_service.GetPackageBlobStream(ctx, pfd.File, pfd.Blob)
+	serveDirectReqParams := make(url.Values)
+	serveDirectReqParams.Set("response-content-type", pfd.Properties.GetByName(container_module.PropertyMediaType))
+	s, u, _, err := packages_service.GetPackageBlobStream(ctx, pfd.File, pfd.Blob, serveDirectReqParams)
 	if err != nil {
 		apiError(ctx, http.StatusInternalServerError, err)
 		return

routers/api/packages/maven/maven.go

@@ -215,7 +215,7 @@ func servePackageFile(ctx *context.Context, params parameters, serveContent bool
 		return
 	}
 
-	s, u, _, err := packages_service.GetPackageBlobStream(ctx, pf, pb)
+	s, u, _, err := packages_service.GetPackageBlobStream(ctx, pf, pb, nil)
 	if err != nil {
 		apiError(ctx, http.StatusInternalServerError, err)
 		return