Make image registries configurable for falco-exporter and falcosidekick

[stone-z]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

If this PR will release a new chart version please make sure to also uncomment the following line:

/kind chart-release

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area falco-chart

/area falco-exporter-chart

/area falcosidekick-chart

What this PR does / why we need it:

This PR allows configuring the registry to use when pulling falco-exporter and falcosidekick. The falco chart already has this capability, so this just aligns the other charts.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

I added "Unreleased" changelogs and did not bump the chart version since I haven't contributed here before, but would be happy to bump the versions if that is preferred

edit: the linter has corrected me. I've bumped the versions.

Checklist

• Chart Version bumped
• Variables are documented in the README.md
• CHANGELOG.md updated

[poiana]

@stone-z: Adding label do-not-merge/contains-merge-commits because PR contains merge commits, which are not allowed in this repository.
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[poiana]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[poiana]

Welcome @stone-z! It looks like this is your first PR to falcosecurity/charts 🎉

[poiana]

Thanks for your pull request. Before we can look at it, you'll need to add a 'DCO signoff' to your commits.

📝 Please follow instructions in the contributing guide to update your commits with the DCO

Full details of the Developer Certificate of Origin can be found at developercertificate.org.

The list of commits missing DCO signoff:

• d8fe276 Add github action for syncing
• fedd372 Update .github/workflows/sync-from-upstream.yaml
• b8b96c1 Use tagged version
• e42e0e8 Merge branch 'add-github-action' of github.com:giantswarm/falco-charts into add-github-action
• 57c1b54 Merge pull request Pull falco chart from helm/charts #1 from giantswarm/add-github-action
• 9165d1a Split up github jobs
• f49b2ff Merge pull request update: adding leogr, nibalizer (approvers + reviewers), nestorsalceda & bencer (as reviewers only) #2 from giantswarm/split-github-jobs
• b9a0af1 Run in sequence
• d3e9c57 Merge pull request Secure Helm Chart #3 from giantswarm/split-github-jobs
• ca0250a Make registry configurable
• 1789e47 Remove workflow to match upstream
• 16014cd Update READMEs
• 331929a Changelogs

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.

[stone-z]

Closing in favor of #254 -- sorry for the noise