[CI][static][workers] write access to allow deleteDir

[v1v]

What does this PR do?

The beats build system somehow create files with read only access and different ownership, this causes issues in the CI when using static workers

Why is it important?

Ensure the static workers can be tear down correctly.

jenkins@worker-0a434dec4bdcd060f:~/workspace/Beats_beats_PR-22662/pkg/mod$ ls -l sigs.k8s.io/structured-merge-diff/v4@v4.0.1/schema/
total 36
-r--r--r-- 1 jenkins jenkins 1178 Feb 24 22:59 doc.go
-r--r--r-- 1 jenkins jenkins 9898 Feb 24 22:59 elements.go
-r--r--r-- 1 jenkins jenkins 3369 Feb 24 22:59 elements_test.go
-r--r--r-- 1 jenkins jenkins 4291 Feb 24 22:59 equals.go
-r--r--r-- 1 jenkins jenkins 3663 Feb 24 22:59 equals_test.go
-r--r--r-- 1 jenkins jenkins 3121 Feb 24 22:59 schemaschema.go
jenkins@worker-0a434dec4bdcd060f:~/workspace/Beats_beats_PR-22662/pkg/mod$ ls -l sigs.k8s.io/structured-merge-diff/v4@v4.0.1/schema/elements_test.go 
-r--r--r-- 1 jenkins jenkins 3369 Feb 24 22:59 sigs.k8s.io/structured-merge-diff/v4@v4.0.1/schema/elements_test.go

Test

[elasticmachine]

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Build stats

• Build Cause: Pull request #24233 updated

• Start Time: 2021-02-25T10:59:16.956+0000

• Duration: 12 min 1 sec

• Commit: 0139e52

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[v1v]

This command is somehow too expensive, it added 4 minutes

[v1v]

This is faster now