NETOBSERV-1678 : Allow custom image at run time

[jpinsonneau]

Description

NETOBSERV_COLLECTOR_IMAGE=xxx oc netobserv flows

Dependencies

n/a

Checklist

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• [ ] Is this PR backed with a JIRA ticket? If so, make sure it is written as a title prefix (in general, PRs affecting the NetObserv/Network Observability product should be backed with a JIRA ticket - especially if they bring user facing changes).
• [ ] Does this PR require product documentation?
  • [ ] If so, make sure the JIRA epic is labelled with "documentation" and provides a description relevant for doc writers, such as use cases or scenarios. Any required step to activate or configure the feature should be documented there, such as new CRD knobs.
• [ ] Does this PR require a product release notes entry?
  • [ ] If so, fill in "Release Note Text" in the JIRA.
• [ ] Is there anything else the QE team should know before testing? E.g: configuration changes, environment setup, etc.
  • [ ] If so, make sure it is described in the JIRA ticket.
• QE requirements (check 1 from the list):
  • [ ] Standard QE validation, with pre-merge tests unless stated otherwise.
  • [ ] Regression tests only (e.g. refactoring with no user-facing change).
  • [ ] No QE (e.g. trivial change with high reviewer's confidence, or per agreement with the QE team).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 31.49%. Comparing base (153b313) to head (588b905). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #42 +/- ## ======================================= Coverage 31.49% 31.49% ======================================= Files 5 5 Lines 962 962 ======================================= Hits 303 303 Misses 637 637 Partials 22 22 ``` | [Flag](https://app.codecov.io/gh/netobserv/network-observability-cli/pull/42/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=netobserv) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/netobserv/network-observability-cli/pull/42/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=netobserv) | `31.49% <ø> (ø)` | | 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=netobserv#carryforward-flags-in-the-pull-request-comment) to find out more.

[openshift-ci[bot]]

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