Add --update flag to zarf dev find-images

[xyzzyz]

Description

Currently, zarf dev find-images just lists the changes needed to be made to zarf.yaml. This PR adds --update flag
that actually executes the change: it replaces the images: list in each of the components with the result of find-images. Care is taken to operate on full YAML AST, so that no whitespace or comments in zarf.yaml are affected.

Example:

amichalik@amichalik-5680-ubuntu:~/work/zarf/examples/argocd$ git status .
On branch amichalik/find-images-update
Your branch is up to date with 'xyzzyz/amichalik/find-images-update'.

nothing to commit, working tree clean
amichalik@amichalik-5680-ubuntu:~/work/zarf/examples/argocd$ ../../build/zarf dev find-images --update 

<snip...>

components:

  - name: argocd-helm-chart
    images:
      - docker.io/library/redis:7.0.15-alpine
      - quay.io/argoproj/argocd:v2.9.6
      # Cosign artifacts for images - argocd - argocd-helm-chart
      - quay.io/argoproj/argocd:sha256-2dafd800fb617ba5b16ae429e388ca140f66f88171463d23d158b372bb2fae08.sig
      - quay.io/argoproj/argocd:sha256-2dafd800fb617ba5b16ae429e388ca140f66f88171463d23d158b372bb2fae08.att

amichalik@amichalik-5680-ubuntu:~/work/zarf/examples/argocd$ git status .
On branch amichalik/find-images-update
Your branch is up to date with 'xyzzyz/amichalik/find-images-update'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git restore <file>..." to discard changes in working directory)
        modified:   zarf.yaml

no changes added to commit (use "git add" and/or "git commit -a")
amichalik@amichalik-5680-ubuntu:~/work/zarf/examples/argocd$ git diff .
diff --git a/examples/argocd/zarf.yaml b/examples/argocd/zarf.yaml
index 8c548465..7fa6dbbd 100644
--- a/examples/argocd/zarf.yaml
+++ b/examples/argocd/zarf.yaml
@@ -16,10 +16,9 @@ components:
           - baseline/values.yaml
     images:
       - docker.io/library/redis:7.0.15-alpine
-      - quay.io/argoproj/argocd:v2.9.6
-      # Cosign artifacts for images - argocd - argocd-helm-chart
-      - quay.io/argoproj/argocd:sha256-2dafd800fb617ba5b16ae429e388ca140f66f88171463d23d158b372bb2fae08.sig
       - quay.io/argoproj/argocd:sha256-2dafd800fb617ba5b16ae429e388ca140f66f88171463d23d158b372bb2fae08.att
+      - quay.io/argoproj/argocd:sha256-2dafd800fb617ba5b16ae429e388ca140f66f88171463d23d158b372bb2fae08.sig
+      - quay.io/argoproj/argocd:v2.9.6
   - name: argocd-apps
     required: true
     charts:

Observe that the rest of zarf.yaml is completely unchanged.

Related Issue

Fixes #

Relates to #

Checklist before merging

• Test, docs, adr added or updated as needed
• Contributor Guide Steps followed

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[phillebaba]

I stated this in #3236 also that we are currently doing work to refactor the packager package which includes find images. It would be great if you could great an issue first so that we could discuss the design of this first. Thank you 💯

[xyzzyz]

Apparently there's already #2865