applicationset.yaml

# ApplicationSet template used for preview app in CI/CD
#
# You need to replace all values following the `<variable_name>` pattern
# and adapt some values from the current template.
# see. https://argo-cd.readthedocs.io/en/stable/operator-manual/applicationset/Generators-Pull-Request/#github
---
apiVersion: argoproj.io/v1alpha1
kind: ApplicationSet
metadata:
  name: <github_repository>-preview
  namespace: <argocd_namespace>
spec:
  generators:
  - pullRequest:
      github:
        owner: <github_username>
        repo: <github_repository>
        labels:
        - preview
        - built
        appSecretName: <repo_secret> # Secret containing Github App infos (see. https://argo-cd.readthedocs.io/en/stable/operator-manual/declarative-setup/#github-app-repositories)
  template:
    metadata:
      name: <github_repository>-preview-pr-{{number}}
    spec:
      destination:
        namespace: <github_repository>-pr-{{number}}
        server: https://kubernetes.default.svc
      project: <argocd_project>
      source:
        repoURL: https://github.com/<github_username>/<github_repository>.git
        path: ./helm
        targetRevision: main # 1.*.*
        helm:
          values: |
            api:
              image:
                tag: pr-{{number}}
              ingress:
                annotations:
                  cert-manager.io/cluster-issuer: <cluster_issuer>
                hosts:
                - host: api.pr-{{number}}.domain.com
                tls:
                - secretName: api.pr-{{number}}.domain.com-tls
                  hosts:
                  - api.pr-{{number}}.domain.com
            docs:
              image:
                tag: pr-{{number}}
              ingress:
                annotations:
                  cert-manager.io/cluster-issuer: <cluster_issuer>
                hosts:
                - host: docs.pr-{{number}}.domain.com
                tls:
                - secretName: docs.pr-{{number}}.domain.com-tls
                  hosts:
                  - docs.pr-{{number}}.domain.com
            ...
      syncPolicy:
        syncOptions:
        - CreateNamespace=true
        - ApplyOutOfSyncOnly=true
        automated:
          selfHeal: true