feat(deployment): support further initContainers

The following patch intoduce the dictionaries pre and postExtraInitContainers.
The dictionaries can be used to specify further initContainers before and after
the gitea initializing process. For example:

```yaml
postExtraInitContainers:
- name: foo
  image: docker.io/library/busybox:latest
preExtraInitContainers:
- name: bar
  image: docker.io/library/busybox:latest
```

README.md

@@ -950,7 +950,7 @@ To comply with the Gitea helm chart definition of the digest parameter, a "custo
 | `global.imagePullSecrets` | global image pull secrets override; can be extended by `imagePullSecrets`                      | `[]`  |
 | `global.storageClass`     | global storage class override                                                                  | `""`  |
 | `global.hostAliases`      | global hostAliases which will be added to the pod's hosts files                                | `[]`  |
-| `namespace`               | An explicit namespace to deploy Gitea into. Defaults to the release namespace if not specified | `""`  |
+| `namespace`               | An explicit namespace to deploy gitea into. Defaults to the release namespace if not specified | `""`  |
 | `replicaCount`            | number of replicas for the deployment                                                          | `1`   |
 
 ### strategy
@@ -1072,6 +1072,8 @@ To comply with the Gitea helm chart definition of the digest parameter, a "custo
 | `persistence.subPath`                             | Subdirectory of the volume to mount at                                                                | `nil`                  |
 | `persistence.volumeName`                          | Name of persistent volume in PVC                                                                      | `""`                   |
 | `extraContainers`                                 | Additional sidecar containers to run in the pod                                                       | `[]`                   |
+| `preExtraInitContainers`                          | Additional init containers to run in the pod before gitea runs it owns init containers.               | `[]`                   |
+| `postExtraInitContainers`                         | Additional init containers to run in the pod after gitea runs it owns init containers.                | `[]`                   |
 | `extraVolumes`                                    | Additional volumes to mount to the Gitea deployment                                                   | `[]`                   |
 | `extraContainerVolumeMounts`                      | Mounts that are only mapped into the Gitea runtime/main container, to e.g. override custom templates. | `[]`                   |
 | `extraInitVolumeMounts`                           | Mounts that are only mapped into the init-containers. Can be used for additional preconfiguration.    | `[]`                   |

templates/gitea/deployment.yaml

@@ -59,6 +59,9 @@ spec:
       securityContext:
         {{- toYaml .Values.podSecurityContext | nindent 8 }}
       initContainers:
+        {{- if .Values.preExtraInitContainers }}
+        {{- toYaml .Values.preExtraInitContainers | nindent 8 }}
+        {{- end }}
         - name: init-directories
           image: "{{ include "gitea.image" . }}"
           imagePullPolicy: {{ .Values.image.pullPolicy }}
@@ -272,6 +275,9 @@ spec:
             {{- include "gitea.init-additional-mounts" . | nindent 12 }}
           resources:
             {{- toYaml .Values.initContainers.resources | nindent 12 }}
+        {{- if .Values.postExtraInitContainers }}
+        {{- toYaml .Values.postExtraInitContainers | nindent 8 }}
+        {{- end }}
       terminationGracePeriodSeconds: {{ .Values.deployment.terminationGracePeriodSeconds }}
       containers:
         - name: {{ .Chart.Name }}

unittests/helm/deployment/extraInitContainers.yaml

@@ -0,0 +1,59 @@
+suite: deployment template
+release:
+  name: gitea-unittests
+  namespace: testing
+templates:
+- templates/gitea/deployment.yaml
+- templates/gitea/config.yaml
+tests:
+- it: Render the deployment (default)
+  asserts:
+  - hasDocuments:
+      count: 1
+    template: templates/gitea/deployment.yaml
+  - lengthEqual:
+      path: spec.template.spec.initContainers
+      count: 3
+    template: templates/gitea/deployment.yaml
+
+- it: Render the deployment (signing)
+  set:
+    signing.enabled: true
+  asserts:
+  - hasDocuments:
+      count: 1
+    template: templates/gitea/deployment.yaml
+  - lengthEqual:
+      path: spec.template.spec.initContainers
+      count: 4
+    template: templates/gitea/deployment.yaml
+
+- it: Render the deployment (extraInitContainers)
+  set:
+    postExtraInitContainers:
+    - name: foo
+      image: docker.io/library/busybox:latest
+    preExtraInitContainers:
+    - name: bar
+      image: docker.io/library/busybox:latest
+    signing.enabled: true
+  asserts:
+  - hasDocuments:
+      count: 1
+    template: templates/gitea/deployment.yaml
+  - lengthEqual:
+      path: spec.template.spec.initContainers
+      count: 6
+    template: templates/gitea/deployment.yaml
+  - contains:
+      path: spec.template.spec.initContainers
+      content:
+        name: foo
+        image: docker.io/library/busybox:latest
+    template: templates/gitea/deployment.yaml
+  - contains:
+      path: spec.template.spec.initContainers
+      content:
+        name: bar
+        image: docker.io/library/busybox:latest
+    template: templates/gitea/deployment.yaml

values.yaml

@@ -279,7 +279,19 @@ persistence:
 extraContainers: []
 #  - name: sidecar-bob
 #    image: busybox
-#    command: [/bin/sh, -c, 'echo "Hello world"; sleep 86400']
+#    command: [/bin/sh, -c, 'echo "Hello world"']
+
+## @param preExtraInitContainers Additional init containers to run in the pod before gitea runs it owns init containers.
+preExtraInitContainers: []
+# - name: pre-init-container
+#   image: docker.io/library/busybox
+#   command: [ /bin/sh, -c, 'echo "Hello world! I am a pre init container."' ]
+
+## @param postExtraInitContainers Additional init containers to run in the pod after gitea runs it owns init containers.
+postExtraInitContainers: []
+# - name: post-init-container
+#   image: docker.io/library/busybox
+#   command: [ /bin/sh, -c, 'echo "Hello world! I am a post init container."' ]
 
 ## @param extraVolumes Additional volumes to mount to the Gitea deployment
 extraVolumes: []