Run restorecon after materialising files

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What this PR does / why we need it:

Enables Embedded Cluster to install in selinux environments by:

• Setting selinux bin_t file context on our bin directory.
• Restoring selinux contexts for data-dir after creation.

Which issue(s) this PR fixes:

Does this PR require a test?

Does this PR require a release note?

Does this PR require documentation?

[github-actions]

This PR has been released (on staging) and is available for download with a embedded-cluster-smoke-test-staging-app license ID.

Online Installer:

curl "https://staging.replicated.app/embedded/embedded-cluster-smoke-test-staging-app/ci/appver-dev-f5b7038" -H "Authorization: $EC_SMOKE_TEST_LICENSE_ID" -o embedded-cluster-smoke-test-staging-app-ci.tgz

Airgap Installer (may take a few minutes before the airgap bundle is built):

curl "https://staging.replicated.app/embedded/embedded-cluster-smoke-test-staging-app/ci-airgap/appver-dev-f5b7038?airgap=true" -H "Authorization: $EC_SMOKE_TEST_LICENSE_ID" -o embedded-cluster-smoke-test-staging-app-ci.tgz

Happy debugging!

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TODO:

• work out how we test this.
• add preflights to catch incorrect path contexts post materialisation

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The preflight would have to be a run collector that checks:

• is selinux present on the system
• is it in enforcing mode
• if both are true, check file contexts on $data-dir/bin

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I've rolled back my test changes after a discussion with @chris-sanders.

I've performed manual testing on selinux enabled systems that prove that this works, but was having significant trouble porting the single node alma linux test over to the cmx testing framework so that we can test automatically with selinux enabled.