Add hostname override to AI upstream customHost setting (#10640)

Co-authored-by: changelog-bot <changelog-bot>

changelog/v1.19.0-beta12/ai-upstream-custom-hostname.yaml

@@ -0,0 +1,6 @@
+changelog:
+- type: NEW_FEATURE
+  issueLink: https://github.com/solo-io/solo-projects/issues/7831
+  resolvesIssue: false
+  description: >
+    Added optional `hostname` to the AI Upstream CustomHost setting to override SNI and host header value 

install/helm/gloo/crds/gloo.solo.io_v1_Upstream.yaml

@@ -47,6 +47,9 @@ spec:
                         properties:
                           host:
                             type: string
+                          hostname:
+                            nullable: true
+                            type: string
                           port:
                             maximum: 4294967295
                             minimum: 0
@@ -121,6 +124,9 @@ spec:
                         properties:
                           host:
                             type: string
+                          hostname:
+                            nullable: true
+                            type: string
                           port:
                             maximum: 4294967295
                             minimum: 0
@@ -157,6 +163,9 @@ spec:
                                         properties:
                                           host:
                                             type: string
+                                          hostname:
+                                            nullable: true
+                                            type: string
                                           port:
                                             maximum: 4294967295
                                             minimum: 0
@@ -231,6 +240,9 @@ spec:
                                         properties:
                                           host:
                                             type: string
+                                          hostname:
+                                            nullable: true
+                                            type: string
                                           port:
                                             maximum: 4294967295
                                             minimum: 0
@@ -259,6 +271,9 @@ spec:
                                         properties:
                                           host:
                                             type: string
+                                          hostname:
+                                            nullable: true
+                                            type: string
                                           port:
                                             maximum: 4294967295
                                             minimum: 0
@@ -322,6 +337,9 @@ spec:
                         properties:
                           host:
                             type: string
+                          hostname:
+                            nullable: true
+                            type: string
                           port:
                             maximum: 4294967295
                             minimum: 0

projects/gloo/api/v1/enterprise/options/ai/ai.proto

@@ -4,6 +4,7 @@ option go_package = "github.com/solo-io/gloo/projects/gloo/pkg/api/v1/enterprise
 
 import "github.com/solo-io/solo-kit/api/v1/ref.proto";
 import "google/protobuf/struct.proto";
+import "google/protobuf/wrappers.proto";
 import "extproto/ext.proto";
 option (extproto.equal_all) = true;
 option (extproto.hash_all) = true;
@@ -60,10 +61,13 @@ message UpstreamSpec {
   // Send requests to a custom host and port, such as to proxy the request,
   // or to use a different backend that is API-compliant with the upstream version.
   message CustomHost {
-    // Custom host to send the traffic requests to.
+    // Custom host or IP address to send the traffic requests to.
     string host = 1;
     // Custom port to send the traffic requests to.
     uint32 port = 2;
+    // Optional: hostname used to set the SNI (if is secure connection) and the host request header.
+    // If hostname is not set, host will be used instead 
+    google.protobuf.StringValue hostname = 3;
   }
 
   // Settings for the [OpenAI](https://platform.openai.com/docs/overview) LLM provider.