fix: Add backend 'https' to default index

[qjoly]

What type of PR is this?

/kind bug

Any specific area of the project related to this PR?

/area cli

What this PR does / why we need it:

This PR will fix the issue #519 by adding the missing 'backend' field when generating the default configuration

old :

indexes:
    - name: falcosecurity
      url: https://falcosecurity.github.io/falcoctl/index.yaml

new:

indexes:
    - name: falcosecurity
      url: https://falcosecurity.github.io/falcoctl/index.yaml
      backend: "https"

Which issue(s) this PR fixes:

Fixes #519

huge thanks to the contributors to the Falco project and its ecosystem.

[poiana]

Welcome @qjoly! It looks like this is your first PR to falcosecurity/falcoctl 🎉

[FedeDP]

Hi! Thanks for this fix, it makes sense!
/milestone v0.8.0

[FedeDP]

/approve

[poiana]

LGTM label has been added.

Git tree hash: 08af20e515d1ee9999751b12c76597d691e9cb7c

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FedeDP, QJoly

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[FedeDP]

Mmmh tide is dead i think. I will try to close and reopen this one.
/close

[FedeDP]

/reopen

[poiana]

@FedeDP: Closed this PR.

In response to this:

Mmmh tide is dead i think. I will try to close and reopen this one.
/close

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[poiana]

@FedeDP: Reopened this PR.

In response to this:

/reopen

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