fix: serialize only the adapter config, not the adapter spec — radicle-ci-broker

Signed-off-by: Lars Wirzenius liw@liw.fi

 then stderr contains "RADICLE_NATIVE_CI="
 then stderr contains "foo: bar"
 then stderr contains "API_KEY: xyzzy"
 when I run cibtool --db ci-broker.db event list
 then stdout is empty

     fn write_adapter_config(&self, tmpdir: &TempDir) -> Result<PathBuf, AdapterError> {
         let filename = tmpdir.path().join("adapter.yaml");
         let json = serde_yml::to_string(self).map_err(AdapterError::AdapterConfigToYaml)?;
         std::fs::write(&filename, json.as_bytes()).map_err(AdapterError::AdapterConfigWrite)?;
         let yaml = serde_yml::to_string(&self.config).map_err(AdapterError::AdapterConfigToYaml)?;
         logger::adapter_temp_config(&filename, &yaml);
         std::fs::write(&filename, yaml.as_bytes()).map_err(AdapterError::AdapterConfigWrite)?;
         Ok(filename)
     }

     AdapterNoSecondMessage,
     AdapterStderrLine,
     AdapterStdoutLine,
     AdapterTempConfig,
     AdapterTooManyMessages,
     BrokerDatabase,

     );
 }
 pub fn adapter_temp_config(filename: &Path, config: &str) {
     debug!(
         msg_id = ?Id::AdapterTempConfig,
         kind = %Kind::AdapterMessage,
         ?filename,
         ?config,
         "adapter config embedded in cib config"
     );
 }
 pub fn adapter_stdout_line(line: &str) {
     trace!(
         msg_id = ?Id::AdapterStdoutLine,