Add key_text option to apt pkgrepo.managed (closes #37936)

It may not always possible or desirable to upload a GPG key to a
keyserver (`keyid`/`keyserver`) or to host it on remote server
(`key_url`). This just leaves storing the key in a state using a
`salt://` URL.

It seems like the states is the wrong place to hold this sort of data,
and would be more suited to being in the pillar.

Adding a `key_text` option to the apt `pkgrepo.managed` module, which
accepts a GPG key in string form, can assist in importing a GPG key from
pillar data.

doc/man/salt.7

@@ -68497,6 +68497,9 @@ key id to load with the keyserver argument
 .B key_url
 URL to a GPG key to add to the APT GPG keyring
 .TP
+.B key_text
+GPG key in string form to add to the APT GPG keyring
+.TP
 .B consolidate
 if \fBTrue\fP, will attempt to de\-dup and consolidate sources
 .TP

salt/modules/aptpkg.py

@@ -2106,6 +2106,9 @@ def mod_repo(repo, saltenv='base', **kwargs):
         key_url
             URL to a GPG key to add to the APT GPG keyring
 
+        key_text
+            GPG key in string form to add to the APT GPG keyring
+
         consolidate
             if ``True``, will attempt to de-dup and consolidate sources
 
@@ -2305,6 +2308,16 @@ def mod_repo(repo, saltenv='base', **kwargs):
                 'Error: failed to add key from {0}'.format(key_url)
             )
 
+    elif 'key_text' in kwargs:
+        key_text = kwargs['key_text']
+        cmd = ['apt-key', 'add', '-']
+        out = __salt__['cmd.run_stdout'](cmd, stdin=key_text,
+                                         python_shell=False, **kwargs)
+        if not out.upper().startswith('OK'):
+            raise CommandExecutionError(
+                'Error: failed to add key:\n{0}'.format(key_text)
+            )
+
     if 'comps' in kwargs:
         kwargs['comps'] = kwargs['comps'].split(',')
         full_comp_list |= set(kwargs['comps'])