Wizard: Update kernel argument validation regex

There are special characters missing from the validation regex.

playwright/Customizations/Kernel.spec.ts

@@ -47,7 +47,7 @@ test('Create a blueprint with Kernel customization', async ({
     await frame.getByRole('button', { name: 'Add kernel argument' }).click();
     await frame
       .getByPlaceholder('Add kernel argument')
-      .fill('invalid/argument');
+      .fill('invalid$argument');
     await frame.getByRole('button', { name: 'Add kernel argument' }).click();
     await expect(
       frame.getByText(

src/Components/CreateImageWizard/validators.ts

@@ -122,7 +122,7 @@ export const isKernelNameValid = (kernelName: string) => {
 };
 
 export const isKernelArgumentValid = (arg: string) => {
-  return /^[a-zA-Z0-9=-_,."']*$/.test(arg);
+  return /^[a-zA-Z0-9=\-_,."'/:#+]*$/.test(arg);
 };
 
 export const isPortValid = (port: string) => {

src/test/Components/Blueprints/ImportBlueprintModal.test.tsx

@@ -262,7 +262,7 @@ keyboard = "invalid-keyboard"
 
 [customizations.kernel]
 name = "--invalid-kernel-name--"
-append = "invalid-kernel-argument"
+append = "invalid$kernel$argument"
 
 [customizations.firewall]
 ports = ["invalid-port"]
@@ -640,7 +640,7 @@ describe('Import modal', () => {
     );
     await waitFor(() =>
       user.click(
-        screen.getByRole('button', { name: /close invalid-kernel-argument/i })
+        screen.getByRole('button', { name: /close invalid\$kernel\$argument/i })
       )
     );