fix(ci): preview ci should target all under src (backport #1054)

[mergify]

This is an automatic backport of pull request #1054 done by Mergify.
Cherry-pick of db0d4cf has failed:

On branch mergify/bp/cryostat-v2.3/pr-1054
Your branch is up to date with 'origin/cryostat-v2.3'.

You are currently cherry-picking commit db0d4cf.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   .github/workflows/ci-preview.yml

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[github-actions]

Hi @mergify[bot]! Add at least one of the required labels to this PR

Required labels are : chore,ci,cleanup,docs,feat,fix,perf,refactor,style,test

[github-actions]

Hi @mergify[bot]! Add at least one of the required labels to this PR

Required labels are : chore,ci,cleanup,docs,feat,fix,perf,refactor,style,test

[github-actions]

Test image available:

CRYOSTAT_IMAGE=ghcr.io/cryostatio/cryostat-web:pr-1101-d494cfa6ebfb114da5a8403ffcda34796973a2e1 sh smoketest.sh