build(meson): generate key_encrypted.pem (#1221)

8191fd8e6c only added one of the two files

test/meson.build

@@ -33,6 +33,12 @@ cert2_pem = custom_target(
   command: [openssl, 'req', '-x509', '-config', test_conf, '-key', '@INPUT@', '-sha256', '-days', '3650', '-nodes', '-out', '@OUTPUT@', '-extensions', 'SAN']
 )
 
+key_encrypted_pem = custom_target(
+  'key_encrypted_pem',
+  output: 'key_encrypted.pem',
+  command: [openssl, 'genrsa', '-passout', 'pass:test123!', '-out', '@OUTPUT@', '2048']
+)
+
 cert_encrypted_pem = custom_target(
   'cert_encrypted_pem',
   input: key_encrypted_pem,