dashboard: fix env/dragonfly-amd64 build

[tuxillo]

Due to several factors as an old pkg version in the ISO, or the amount
of changes that have gone to the binary packages since 6.4.0 was
released, a bit of a workaround is needed in phase2.sh

For golang/go#64684.

[gopherbot]

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Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Message from Dmitri Shuralyov:

Patch Set 2: Code-Review+2

(1 comment)

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Message from Dmitri Shuralyov:

Patch Set 2: Code-Review+1

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Message from Carlos Amedee:

Patch Set 2: Code-Review+1

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Message from Carlos Amedee:

Patch Set 2: Commit-Queue+1

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Message from Go LUCI:

Patch Set 2:

Dry run: CV is trying the patch.

Bot data: {"action":"start","triggered_at":"2024-03-18T14:23:08Z","revision":"e33e7f61584a80b78964d4bdea76e990a64edae4"}

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Message from Carlos Amedee:

Patch Set 2: -Commit-Queue

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Message from Go LUCI:

Patch Set 2:

This CL has passed the run

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Message from Go LUCI:

Patch Set 2: LUCI-TryBot-Result+1

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[tuxillo]

any news?