fix: stop discarding file close and test setup errors (#39987)

- Fix
https://github.com/go-gitea/gitea/security/quality/rules/go%2Funhandled-writable-file-close,
ignored close errors hide failed flushes, which could lose rotated logs
and truncate authorized_keys
- Fix `TestProjects` fixture reset, from
https://github.com/go-gitea/gitea/security/quality/ai-findings,
`TruncateBeans` rejected the table names and the ignored error let the
test run against fixture data

models/asymkey/ssh_key_authorized_keys.go

@@ -6,6 +6,7 @@ package asymkey
 import (
 	"bufio"
 	"context"
+	"errors"
 	"fmt"
 	"io"
 	"os"
@@ -107,7 +108,7 @@ func writeAuthorizedStringForKey(key *PublicKey, w io.Writer) (keyValid bool, er
 }
 
 // appendAuthorizedKeysToFile appends new SSH keys' content to authorized_keys file.
-func appendAuthorizedKeysToFile(keys ...*PublicKey) error {
+func appendAuthorizedKeysToFile(keys ...*PublicKey) (err error) {
 	// Don't need to rewrite this file if builtin SSH server is enabled.
 	if setting.SSH.StartBuiltinServer || !setting.SSH.CreateAuthorizedKeysFile {
 		return nil
@@ -133,7 +134,7 @@ func appendAuthorizedKeysToFile(keys ...*PublicKey) error {
 	if err != nil {
 		return err
 	}
-	defer f.Close()
+	defer func() { err = errors.Join(err, f.Close()) }()
 
 	// Note: chmod command does not support in Windows.
 	if !consts.IsWindows {