bug#30246: 25.2.50; auth-source does not support creation or deletion with secrets provider

[Allen Li <vianchielfaura@gmail.com>]

auth-source does not support saving secrets with the Secrets API
backend.  This reduces the usefulness of auth-source significantly
since keychains that provide secure secret storage using the API are
standard on many GNU/Linux distributions (e.g., gnome-keyring on
Ubuntu).

(auth-source-search :type 'secrets :max 1
                    :host "localhost"
                    :user "user"
                    :create '(secret user host))

Debugger entered--Lisp error: (cl-assertion-failed ((not create) "The
Secrets API auth-source backend doesn't support creation yet"))
  cl--assertion-failed((not create) "The Secrets API auth-source
backend doesn't support creation yet" nil nil)
  auth-source-secrets-search(:backend
[eieio-class-tag--auth-source-backend secrets "Login" t t t nil
auth-source-secrets-create auth-source-secrets-search] :type secrets
:max 1 :require nil :create (secret user host) :delete nil :type
secrets :max 1 :host "localhost" :user "user" :create (secret user
host))
  apply(auth-source-secrets-search :backend
[eieio-class-tag--auth-source-backend secrets "Login" t t t nil
auth-source-secrets-create auth-source-secrets-search] :type secrets
:max 1 :require nil :create (secret user host) :delete nil (:type
secrets :max 1 :host "localhost" :user "user" :create (secret user
host)))
  auth-source-search-backends(([eieio-class-tag--auth-source-backend
secrets "Login" t t t nil auth-source-secrets-create
auth-source-secrets-search]) (:type secrets :max 1 :host "localhost"
:user "user" :create (secret user host)) 1 (secret user host) nil nil)
  auth-source-search(:type secrets :max 1 :host "localhost" :user
"user" :create (secret user host))
  eval((auth-source-search :type (quote secrets) :max 1 :host
"localhost" :user "user" :create (quote (secret user host))) nil)
  elisp--eval-last-sexp(nil)
  eval-last-sexp(nil)
  funcall-interactively(eval-last-sexp nil)
  #<subr call-interactively>(eval-last-sexp nil nil)
  apply(#<subr call-interactively> eval-last-sexp (nil nil))
  call-interactively@ido-cr+-record-current-command(#<subr
call-interactively> eval-last-sexp nil nil)
  apply(call-interactively@ido-cr+-record-current-command #<subr
call-interactively> (eval-last-sexp nil nil))
  call-interactively(eval-last-sexp nil nil)
  command-execute(eval-last-sexp)