Add values for extraContainers in deployment

[YurNaybor]

Problem Statement

Adding sidecar containers to the external secrets operator.

Related Issue

Fixes #2072

Proposed Changes

Implementing the value extraContainers allows for simply configuring additional / sidecar containers via values.yaml

Checklist

• I have read the contribution guidelines
• All commits are signed with git commit --signoff
• My changes have reasonable test coverage
• All tests pass with make test
• I ensured my PR is ready for review with make reviewable

[paul-the-alien]

Greetings!
Thank you for contributing to this project!
If this is your first time contributing, please make
sure to read the Developer and Contributing Process guides.
Please also mind and follow our Code of Conduct.

Useful commands:

• make fmt: Formats the code
• make check-diff: Ensures the branch is clean
• make reviewable: Ensures a PR is ready for review

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[YurNaybor]

I'm currently struggling to get make reviewable run. Even after running make fmt it complains about files I didn't even touch:

pkg/provider/register/register.go:21:2: blank-imports: a blank import should be only in a main or test package, or have a comment justifying it (revive)
	_ "github.com/external-secrets/external-secrets/pkg/provider/akeyless"
	^
pkg/generator/register/register.go:21:2: blank-imports: a blank import should be only in a main or test package, or have a comment justifying it (revive)
	_ "github.com/external-secrets/external-secrets/pkg/generator/acr"
	^
pkg/provider/register/register.go:18:1: directive `//nolint:revive` is unused for linter "revive" (nolintlint)
//nolint:revive
^
pkg/generator/register/register.go:18:1: directive `//nolint:revive` is unused for linter "revive" (nolintlint)
//nolint:revive

[YurNaybor]

Alright, make reviewable is working now that I reverted the (local) changes of make fmt.

[moolen]

👍 thanks for adding this, appreciated!