Make S3 output compatible with non-AWS S3 API-compliant endpoints

[gysel]

Changes:

• add AWS.S3.Endpoint configuration option
• make canned ACL configurable
• add MinIO to docker-compose.yaml for local testing

/kind feature
/area outputs

I tested this change against IBM Cloud COS and a local MinIO instance.

Example config.yaml for the local MinIO:

aws:
  region: minio
  checkidentity: false
  accesskeyid: xxx
  secretaccesskey: xxx
  s3:
    bucket: falco-test
    endpoint: http://minio.localhost:9000
    objectcannedacl: ""

[poiana]

Welcome @gysel! It looks like this is your first PR to falcosecurity/falcosidekick 🎉

[Issif]

amazing! thanks!

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gysel, Issif

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[poiana]

LGTM label has been added.

Git tree hash: 792a5d3a8fca7ca6218f16b8da7333a81a4bad83

[gysel]

Thanks for the quick review & merge! Looking forward to the next release...