[7.15](backport #1764) fix: properly copy files from compose to elastic-package

[mergify]

This is an automatic backport of pull request #1764 done by Mergify.

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[elasticmachine]

💔 Tests Failed

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Build stats

• Start Time: 2021-11-03T09:54:19.394+0000

• Duration: 42 min 58 sec

• Commit: d5400ae

Test stats 🧪

Test	Results
Failed	2
Passed	239
Skipped	0
Total	241

Test errors

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Initializing / End-To-End Tests / ubuntu-18.04_fleet_policies / Example using Kibana with custom policy – Preconfigured Policies

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 Step system package dashboards are listed in Fleet 

• no stacktrace

Initializing / End-To-End Tests / ubuntu-18.04_fleet_policies / Example using Kibana with default config – Preconfigured Policies

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 Step a "centos" agent is deployed to Fleet with "tar" installer 

• no stacktrace

Steps errors

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Run functional tests for ubuntu-18.04:fleet:policies && ~@nightly && ~debian && ~@skip:amd64

• Took 18 min 10 sec . View more details here
• Description: .ci/scripts/functional-test.sh "fleet" "policies && ~@nightly && ~debian && ~@skip:amd64" "7.15-SNAPSHOT" "7.15-SNAPSHOT"

Archive the artifacts

• Took 0 min 1 sec . View more details here
• Description: [2021-11-03T10:24:30.625Z] Archiving artifacts script returned exit code 2

🐛 Flaky test report

❕ There are test failures but not known flaky tests.

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Genuine test errors

💔 There are test failures but not known flaky tests, most likely a genuine test failure.

• Name: Initializing / End-To-End Tests / ubuntu-18.04_fleet_policies / Example using Kibana with custom policy – Preconfigured Policies
• Name: Initializing / End-To-End Tests / ubuntu-18.04_fleet_policies / Example using Kibana with default config – Preconfigured Policies

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