using go env GOARCH to detect system arch instead of uname

[acornett21]

Issue #, if available:
N/A

Description of changes:
uname does not always match the friendly arch that operator-sdk, an example is that on a normal mac you get x86_64 which fails to download since operator-sdk is released as amd64, there could be other examples as well.

Other things I thought of, since we might not want to rely on go env and be tied to go-tools:

• uname -m | tr '[:upper:]' '[:lower:]' | sed 's/x86_64/amd64/g'
• have this script take in arch as an arg

Let me know which approach would be best

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Signed-off-by: Adam D. Cornett [email protected]

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[a-hilaly]

LGTM, thanks Adam! the go env should be good.
/ok-to-test
/approve

[ack-bot]

@acornett21: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
s3-controller-test	d670ceb	link	/test s3-controller-test

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[a-hilaly]

/retest
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: A-Hilaly, acornett21

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