fix warnings when build images

[nayihz]

fix warnings when build images

 1 warning found (use docker --debug to expand):
 - FromAsCasing: 'as' and 'FROM' keywords' casing do not match (line 2)

and

 => WARN: LegacyKeyValueFormat: "LABEL key=value" should be used instead of legacy "LABEL key value" format (line 5)                                                                           0.0s
 => WARN: LegacyKeyValueFormat: "LABEL key=value" should be used instead of legacy "LABEL key value" format (line 6)                                                                           0.0s
 => WARN: LegacyKeyValueFormat: "LABEL key=value" should be used instead of legacy "LABEL key value" format (line 8)  

[nayihz]

/assign @shaneutt
PTAL at your convenience.

[shaneutt]

Hi @nayihz, thanks for the PR!

We recently made a large change to the main branch which removes the older Golang control-plane (see this), so you'll probably wanna rebase and some of the changes (particularly the Golang control-plane related ones) will need to be changed.

[shaneutt]

/approve
/lgtm

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