[dashboard/server] Fix "start-workspace-cycle" on image builder errors

[geropl]

Fixes #4856.

I pushed bf44fa1 should serve as reproducer for #4856.

Test

1. Go to https://gpl-4856-prebuild-cycle.staging.gitpod-dev.com/workspaces/
2. Open dev console
3. Start a prebuild suing /#prebuild/ which triggers a fresh image-build that takes longer than 1 minute
4. Note how you see exactly one line of /start: started workspace instance: after ~1 minute
5. Note how you get stuck on the prebuild page 😕 (cmp. Prebuild process gets stuck (when updating .gitpod.Dockerfile) #4856 (comment))

[codecov]

Codecov Report

Merging #4875 (bf44fa1) into main (f5793c3) will increase coverage by 34.44%.
The diff coverage is n/a.

❗ Current head bf44fa1 differs from pull request most recent head 3b89aac. Consider uploading reports for the commit 3b89aac to get more accurate results

@@            Coverage Diff            @@
##           main    #4875       +/-   ##
=========================================
+ Coverage      0   34.44%   +34.44%     
=========================================
  Files         0        1        +1     
  Lines         0       90       +90     
=========================================
+ Hits          0       31       +31     
- Misses        0       55       +55     
- Partials      0        4        +4     

Flag	Coverage Δ
components-image-builder-app	34.44% <ø> (?)

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Impacted Files	Coverage Δ
components/image-builder/pkg/resolve/resolve.go	34.44% <0.00%> (ø)

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[geropl]

/assign @csweichel

[AlexTugarev]

(With the current test setup, i.e. test commit) I get the deadline exceeded error as follows

[geropl]

(With the current test setup, i.e. test commit) I get the deadline exceeded error as follows

@AlexTugarev That looks good so far. Do you see the single line /start: started workspace instance: in the web console as mentioned here?

[AlexTugarev]

Do you see the single line /start: started workspace instance: in the web console as mentioned here?

yes. that's true.

[geropl]

Do you see the single line /start: started workspace instance: in the web console as mentioned here?

yes. that's true.

Test succeeded ✔️

Will remove the test commit.

[AlexTugarev]

LGTM!
Code changes make sense.
Waited to for the re-deploy to verify it's not breaking things.

[roboquat]

LGTM label has been added.

Git tree hash: d6a5ccd70d98e5fd76004a1b140ad785dcf89a58

[roboquat]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AlexTugarev, geropl

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