# Type of request: This is a ...

[*] bug report
[ ] feature request

# Detailed description

Perhaps not a bug report per se, but this affected me at least. A new version of `lambci/docker-lambda` was pushed recently. [This commit](https://github.com/lambci/docker-lambda/commit/7ece2742a5b0e84eb09d6ed659f123474e619b27) removed hardcoded defaults for `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY`.

I have a lambda that reads a value from secret in `secretsmanager`. If I don't set dummy values for `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` when creating the lambda invoking it will time out reading the secret.

## Expected behavior

A lambda function can read a secret from `secretsmanager`.

## Actual behavior

Lambda times out trying to read secret.

# Steps to reproduce

Create a lambda which tries to read a secret from `secretsmanager` without adding the environments variables mentioned above.

## Command used to start LocalStack

## Client code (AWS SDK code snippet, or sequence of "awslocal" commands)

This will work:
```bash
awslocal lambda create-function \
  --function-name foo \
  --runtime go1.x \
  --handler main \
  --role arn:aws:iam::123456790:role/ignore \
  --zip-file fileb://foo.zip \
  --environment "Variables={FOO=bar,AWS_ACCOUNT_ID=123456790,AWS_ACCESS_KEY_ID=0,AWS_SECRET_ACCESS_KEY=0}"
```

This will time out while reading:
```bash
awslocal lambda create-function \
  --function-name foo \
  --runtime go1.x \
  --handler main \
  --role arn:aws:iam::123456790:role/ignore \
  --zip-file fileb://foo.zip \
  --environment "Variables={FOO=bar}"
```
try:
        return event['Records'][0][key]
    except KeyError:
        return None
def is_java_lambda(lambda_details):
    runtime = getattr(lambda_details, 'runtime', lambda_details)
    return runtime in [LAMBDA_RUNTIME_JAVA8, LAMBDA_RUNTIME_JAVA11]
def is_nodejs_runtime(lambda_details):
    runtime = getattr(lambda_details, 'runtime', lambda_details)
    return runtime.startswith('nodejs')
def _store_logs(func_details, log_output, invocation_time=None, container_id=None):
    log_group_name = '/aws/lambda/%s' % func_details.name()
    container_id = container_id or short_uid()
    invocation_time = invocation_time or int(time.time() * 1000)
    invocation_time_secs = int(invocation_time / 1000)
    time_str = time.strftime('%Y/%m/%d', time.gmtime(invocation_time_secs))
    log_stream_name = '%s/[LATEST]%s' % (time_str, container_id)
    return store_cloudwatch_logs(log_group_name, log_stream_name, log_output, invocation_time)
def get_main_endpoint_from_container():