feat: add influx-cli image

[alespour]

This PR adds influx-cli image. The image is intended for CLI-based tasks like backup etc. Its size is "only" ~44 MB, compared to 226 MB of influxdb. Dockerfile content was ripped out of influxdb image.

Default command is version.

[timhallinflux]

I think we need a License file too. This is MIT licensed. We can grab the file from the core InfluxDB portion of this repo.

[timhallinflux]

I believe this is also missing a manifest.json file.

{
  "name": "influxdb-cli",
  "maintainers": [
    "Jonathan A. Sternberg <jonathan@influxdata.com> (@jsternberg)",
    "Bucky Schwarz <bucky@influxdata.com> (@hoorayimhelping)",
    "Brandon Pfeifer  <bpfeifer@influxdata.com> (@bnpfeife)"
  ],
  "versions": ["2.2"],
  "architectures": [
    "amd64",
    "arm32v7",
    "arm64v8"
  ],
  "variants": [
    {"name": "alpine"}
  ]
}

[samhld]

LGTM