fix(oci): use home region for identity bootstrap (#12909)

Co-authored-by: Pedro Martín <pedromarting3@gmail.com>

ui/components/providers/workflow/forms/via-credentials/oraclecloud-credentials-form.tsx

@@ -4,6 +4,9 @@ import {
   WizardInputField,
   WizardTextareaField,
 } from "@/components/providers/workflow/forms/fields";
+import { Combobox } from "@/components/shadcn/combobox";
+import { FormControl, FormField, FormMessage } from "@/components/shadcn/form";
+import { OCI_REGION_GROUPS } from "@/lib/provider-credentials/oci-regions";
 import { ProviderCredentialFields } from "@/lib/provider-credentials/provider-credential-fields";
 import { OCICredentials } from "@/types";
 
@@ -48,6 +51,34 @@ export const OracleCloudCredentialsForm = ({
         variant="bordered"
         isRequired
       />
+      <FormField
+        control={control}
+        name={ProviderCredentialFields.OCI_REGION}
+        render={({ field }) => (
+          <div className="flex flex-col gap-1.5">
+            <span className="text-text-neutral-tertiary text-xs font-light tracking-tight">
+              Home Region<span className="text-text-error-primary">*</span>
+            </span>
+            <FormControl>
+              <Combobox
+                aria-label="Home Region"
+                value={field.value ?? ""}
+                onValueChange={field.onChange}
+                groups={OCI_REGION_GROUPS}
+                placeholder="Select your tenancy home region"
+                searchPlaceholder="Search region..."
+                emptyMessage="No region found."
+                contentClassName="z-[60] sm:w-(--radix-popover-trigger-width) sm:max-w-none"
+              />
+            </FormControl>
+            <span className="text-text-neutral-tertiary text-xs">
+              Shown in the OCI Console under Tenancy Details. Used only to
+              validate the credentials: all subscribed regions are scanned.
+            </span>
+            <FormMessage className="text-text-error-primary max-w-full text-xs" />
+          </div>
+        )}
+      />
       <WizardTextareaField
         control={control}
         name={ProviderCredentialFields.OCI_KEY_CONTENT}