Add global environment variable config

[swang392]

What does this PR do?

Added configuration for global environment variables; environment variables defined in global.env of the Datadog Agent CRD will be set across all agents in Operator.

Motivation

issue 961

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

• add example env variables to local Datadog Agent yaml file and check the logs and CRD when deploying to operator

Checklist

• [ ] PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• [ ] PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 35.00000% with 13 lines in your changes missing coverage. Please review.

Project coverage is 47.63%. Comparing base (6d4bbd9) to head (4a0a15a). Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/controller/testutils/agent.go	0.00%	13 Missing :warning:

Additional details and impacted files

[](https://app.codecov.io/gh/DataDog/datadog-operator/pull/1406?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) ```diff @@ Coverage Diff @@ ## main #1406 +/- ## ========================================== + Coverage 47.40% 47.63% +0.22% ========================================== Files 223 224 +1 Lines 19244 19522 +278 ========================================== + Hits 9123 9299 +176 - Misses 9635 9723 +88 - Partials 486 500 +14 ``` | [Flag](https://app.codecov.io/gh/DataDog/datadog-operator/pull/1406/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/DataDog/datadog-operator/pull/1406/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | `47.63% <35.00%> (+0.22%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files with missing lines](https://app.codecov.io/gh/DataDog/datadog-operator/pull/1406?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) | Coverage Δ | | |---|---|---| | [api/datadoghq/v2alpha1/datadogagent\_types.go](https://app.codecov.io/gh/DataDog/datadog-operator/pull/1406?src=pr&el=tree&filepath=api%2Fdatadoghq%2Fv2alpha1%2Fdatadogagent_types.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-YXBpL2RhdGFkb2docS92MmFscGhhMS9kYXRhZG9nYWdlbnRfdHlwZXMuZ28=) | `100.00% <ø> (ø)` | | | [api/datadoghq/v2alpha1/test/builder.go](https://app.codecov.io/gh/DataDog/datadog-operator/pull/1406?src=pr&el=tree&filepath=api%2Fdatadoghq%2Fv2alpha1%2Ftest%2Fbuilder.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-YXBpL2RhdGFkb2docS92MmFscGhhMS90ZXN0L2J1aWxkZXIuZ28=) | `91.49% <100.00%> (+0.04%)` | :arrow_up: | | [...nternal/controller/datadogagent/override/global.go](https://app.codecov.io/gh/DataDog/datadog-operator/pull/1406?src=pr&el=tree&filepath=internal%2Fcontroller%2Fdatadogagent%2Foverride%2Fglobal.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-aW50ZXJuYWwvY29udHJvbGxlci9kYXRhZG9nYWdlbnQvb3ZlcnJpZGUvZ2xvYmFsLmdv) | `42.14% <100.00%> (+0.97%)` | :arrow_up: | | [internal/controller/testutils/agent.go](https://app.codecov.io/gh/DataDog/datadog-operator/pull/1406?src=pr&el=tree&filepath=internal%2Fcontroller%2Ftestutils%2Fagent.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog#diff-aW50ZXJuYWwvY29udHJvbGxlci90ZXN0dXRpbHMvYWdlbnQuZ28=) | `0.00% <0.00%> (ø)` | | ... and [2 files with indirect coverage changes](https://app.codecov.io/gh/DataDog/datadog-operator/pull/1406/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) ------ [Continue to review full report in Codecov by Sentry](https://app.codecov.io/gh/DataDog/datadog-operator/pull/1406?dropdown=coverage&src=pr&el=continue&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog). > **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog) > `Δ = absolute (impact)`, `ø = not affected`, `? = missing data` > Powered by [Codecov](https://app.codecov.io/gh/DataDog/datadog-operator/pull/1406?dropdown=coverage&src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog). Last update [6d4bbd9...4a0a15a](https://app.codecov.io/gh/DataDog/datadog-operator/pull/1406?dropdown=coverage&src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=DataDog).