Add usernames and sudo_usernames fields to VM request form

- DB: add usernames/sudo_usernames columns to vm_requests table
- create.php: add form inputs for usernames and sudo_usernames
- send.php: capture, validate, and store both fields in DB
- netbox_integration/netbox_api.php: pass custom_fields to NetBox VM API
- requests.php: show usernames/sudo_usernames in request list

create.php

@@ -114,6 +114,34 @@ $error = $_GET['error'] ?? '';
                 ></textarea>
             </div>
 
+            <div class="form-group">
+                <label for="usernames">Usernames <span style="font-weight:400;color:var(--text-tertiary)">(comma-separated, optional)</span></label>
+                <span class="field-label-sub">Linux user accounts to create on this VM (e.g. <em>jdoe, admin</em>).</span>
+                <input
+                    type="text"
+                    id="usernames"
+                    name="usernames"
+                    maxlength="500"
+                    placeholder="jdoe, admin"
+                    autocomplete="off"
+                    spellcheck="false"
+                >
+            </div>
+
+            <div class="form-group">
+                <label for="sudo_usernames">Sudo Usernames <span style="font-weight:400;color:var(--text-tertiary)">(comma-separated, optional)</span></label>
+                <span class="field-label-sub">Which users should have sudo access (e.g. <em>admin</em>).</span>
+                <input
+                    type="text"
+                    id="sudo_usernames"
+                    name="sudo_usernames"
+                    maxlength="500"
+                    placeholder="admin"
+                    autocomplete="off"
+                    spellcheck="false"
+                >
+            </div>
+
             <button type="submit" id="submitBtn">
                 <span class="btn-label">Submit Request</span>
             </button>