[GITEA] Make atomic ssh keys replacement robust

- After stumbling upon https://github.com/golang/go/issues/22397 and
reading the implementations I realized that Forgejo code doesn't have
`Sync()` and it doesn't properly error handle the `Close` function.
- (likely) Resolves https://codeberg.org/forgejo/forgejo/issues/1446

(cherry picked from commit 0efcb334c2)
(cherry picked from commit 04ef02c0dd)
(cherry picked from commit 85f2065c9b)
(cherry picked from commit 8d36b5cce6)
(cherry picked from commit 378dc30fb5)
(cherry picked from commit 2b28bf826e)
(cherry picked from commit d0625a001e)
(cherry picked from commit f161a4f60f)
(cherry picked from commit 7430ca43e5)
(cherry picked from commit ab6d38daf7)
(cherry picked from commit 0f703fd02e)
(cherry picked from commit 6931a8f6bb)
(cherry picked from commit 5e2065c1c0)
(cherry picked from commit 38c812acff)
(cherry picked from commit 494874e23f)
(cherry picked from commit d396b7fd47)

models/asymkey/ssh_key_authorized_keys.go

@@ -169,7 +169,12 @@ func RewriteAllPublicKeys(ctx context.Context) error {
 		return err
 	}
 
-	t.Close()
+	if err := t.Sync(); err != nil {
+		return err
+	}
+	if err := t.Close(); err != nil {
+		return err
+	}
 	return util.Rename(tmpPath, fPath)
 }
 

models/asymkey/ssh_key_authorized_principals.go

@@ -92,7 +92,12 @@ func RewriteAllPrincipalKeys(ctx context.Context) error {
 		return err
 	}
 
-	t.Close()
+	if err := t.Sync(); err != nil {
+		return err
+	}
+	if err := t.Close(); err != nil {
+		return err
+	}
 	return util.Rename(tmpPath, fPath)
 }