Ensure shas retrieved by workflow are ordered by date

[adam-cattermole]

The http-request-action@master is deprecated in favour of main/v1.

The response from this action does not seem to be ordered correctly (at least for the policy-controller), when curling locally the order of the tags is by date, but the action seems to be consistently returning the tags in the incorrect order:

"tags": {
    "2451921": {
        "name": "2451921",
        "size": 29951865,
        "last_modified": "Thu, 30 Nov 2023 16:44:16 -0000",
        "manifest_digest": "sha256:e2ea6a7340dd61e55dbef4f89fefc860f64b1b444f03a1ffd02058abaa667323"
    },
    "3019274": {
        "name": "3019274",
        "size": 28848877,
        "last_modified": "Mon, 13 Nov 2023 12:17:30 -0000",
        "manifest_digest": "sha256:861bd416069c8659c0d69e24f6b1ad6945b8c45a75a4efcef9f503f6cffeeac0"
    },
    "4390036": {
        "name": "4390036",
        "size": 29951865,
        "last_modified": "Thu, 30 Nov 2023 09:43:09 -0000",
        "manifest_digest": "sha256:f1fd29370141a33ac95c15e57cedbd9a93cb7ca2bae0aa9557e7dde01fc43ef1"
    },
    "5012370": {
        "name": "5012370",
        "size": 27952337,
        "last_modified": "Tue, 07 Nov 2023 09:31:24 -0000",
        "manifest_digest": "sha256:af33a04cb979273a4c835bb6bc793a2ea294a9828cced59dcbcaf940843ac465"
    },
    "5927261": {
        "name": "5927261",
        "size": 29951865,
        "last_modified": "Tue, 28 Nov 2023 11:42:59 -0000",
        "manifest_digest": "sha256:7bcba161ce28b6d7ff0e1c1ccb0acc13690815c56a6091232d71818d429771fb"
    },
    "9925934": {
        "name": "9925934",
        "size": 30035957,
        "last_modified": "Tue, 09 Jan 2024 12:00:24 -0000",
        "manifest_digest": "sha256:2df4aa4d851b1d6dcd0edafae54ac87d7c9b6bfc4cb9942f1b80561b4cf4bf86"
    },
    "main": {
        "name": "main",
        "size": 30036549,
        "last_modified": "Fri, 12 Jan 2024 15:44:43 -0000",
        "manifest_digest": "sha256:3d46a9c47beb89b1e1056b43c843150c473513023fa2af163efe5cf85c7e480e"
    },

...

Our nightly is therefore trying to use the policy-controller commit sha 2451921 - this commit was before the kustomization file was added and will fail due to short commit sha Kuadrant/multicluster-gateway-controller#761.

This PR sorts by the last_modified date and takes the last matching sha entry instead of using the default ordering taking the first matching sha entry. Once merged nightly builds should function again.

[codecov]

Codecov Report

Merging #394 (107927f) into main (ed590ec) will decrease coverage by 0.08%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #394      +/-   ##
==========================================
- Coverage   66.18%   66.11%   -0.08%     
==========================================
  Files          37       37              
  Lines        3842     3842              
==========================================
- Hits         2543     2540       -3     
- Misses       1113     1116       +3     
  Partials      186      186              

Flag	Coverage Δ
integration	71.56% <ø> (-0.15%)	⬇️
unit	60.14% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
api/v1beta1 (u)	∅ <ø> (∅)
pkg/common (u)	78.59% <ø> (ø)
pkg/istio (u)	37.11% <ø> (ø)
pkg/log (u)	31.81% <ø> (ø)
pkg/reconcilers (u)	33.44% <ø> (ø)
pkg/rlptools (u)	56.46% <ø> (ø)
controllers (i)	71.56% <ø> (-0.15%)	⬇️

see 6 files with indirect coverage changes

[didierofrivia]

🍔