docs(git): tell how to pass HTTPS credentials (#1782)

Fixes #466

docs/faq.md

@@ -192,3 +192,22 @@ $ copier copy -r HEAD ./src ./dst
 
 ... then you'll notice `new-file.txt` does exist. You passed a specific ref to copy, so
 Copier skips its autodetection and just goes for the `HEAD` you already chose.
+
+## How to pass credentials to Git?
+
+If you do something like this, and the template supports updates, you'll notice that the
+credentials will end up stored in [the answers file][file][the-copier-answersyml-file]:
+
+```shell
+copier copy https://myuser:example.com/repo.git .
+```
+
+To avoid that, the simplest fix is to clone using SSH with cryptographic key
+authentication. If you cannot do that, then check out these links for strategies on
+passing HTTPS credentials to Git:
+
+-   https://github.com/copier-org/copier/issues/466#issuecomment-2338160284
+-   https://stackoverflow.com/q/35942754
+-   https://git-scm.com/docs/gitcredentials
+-   https://git-scm.com/book/en/v2/Git-Tools-Credential-Storage#_credential_caching
+-   https://github.com/topics/git-credential-helper