fix: Dockerfile CMD syntax

[rophy]

Original syntax will result in:

$ make image
docker build -t cluster-capacity .
Sending build context to Docker daemon  161.9MB
Step 1/6 : FROM golang:latest
...
Successfully built dae542bae31f
Successfully tagged cluster-capacity:latest

$ docker run --rm cluster-capacity:latest
docker: Error response from daemon: OCI runtime create failed: container_linux.go:380: starting container process caused: exec: "/bin/cluster-capacity --help": stat /bin/cluster-capacity --help: no such file or directory: unknown.

[linux-foundation-easycla[bot]]

• :white_check_mark:login: yltsaize / (75e690d5f2d0c730f6ef4dfcb87b5024569d1c5e)

The committers listed above are authorized under a signed CLA.

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Hi @rophy. Thanks for your PR.

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[ingvagabund]

/ok-to-test

[ingvagabund]

/approve /lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ingvagabund, rophy

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[rophy]

/remove-lifecycle stale