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Helm/Kustomize generated ArgoCD applications

argocd-diff-preview will only look for YAML files in the repository with kind: Application or kind: ApplicationSet. If your applications are generated from a Helm chart or Kustomize template, you will have to add a step in the pipeline that renders the chart/template.

Helm and Kustomize examples:

.github/workflows/generate-diff.yml
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jobs:
  build:
    ...
    steps:
      ...
    - uses: actions/checkout@v4
      with:
        path: pull-request

    - name: Generate with helm chart
      run: helm template pull-request/some/path/my-chart > pull-request/rendered-apps.yaml

    - name: Generate with kustomize
      run: kustomize build pull-request/some/path/my-kustomize > pull-request/rendered-apps.yaml

    - name: Generate Diff
      run: |
        docker run \
          --network=host \
          -v /var/run/docker.sock:/var/run/docker.sock \
          -v $(pwd)/main:/base-branch \
          ...
This will place the rendered manifests inside the pull-request folder, and the tool will pick them up.