Make SMTP test CA readable by delivery agent

contrib/testing/smtp-required-tls-check.py

@@ -251,6 +251,7 @@ def make_tls_context(directory: Path) -> tuple[ssl.SSLContext, Path]:
     key = directory / "server.key"
     certificate = directory / "server.crt"
     template = directory / "cert.cfg"
+    directory.chmod(0o755)
     template.write_text(
         'cn = "smtp08.test"\n'
         'dns_name = "*.smtp08.test"\n'
@@ -279,6 +280,7 @@ def make_tls_context(directory: Path) -> tuple[ssl.SSLContext, Path]:
         "--outfile",
         str(certificate),
     ])
+    certificate.chmod(0o644)
     context = ssl.SSLContext(ssl.PROTOCOL_TLS_SERVER)
     context.minimum_version = ssl.TLSVersion.TLSv1_2
     context.load_cert_chain(certificate, key)