feat(chart): Make the securityContext for the StatefulSet configurable (#62)

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### Description of the change

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This patch adds the ability to **customize the `SecurityContext`** for the `statefulset` of the Gitea Actions `act_runner`.
This allows users to configure pod-level security settings, such as `fsGroup` and `fsGroupChangePolicy`.
The patch introduces `statefulset.podSecurityContext` as a new configurable parameter.

### Benefits

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This change makes the chart more configurable for different kinds of deployment scenarios.

### Possible drawbacks

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### Applicable issues

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- Fixes #

### Additional information

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  * The patch only adds the ability to customize the `podSecurityContext` for the `statefulset`. It does not modify any other security settings or introduce new features beyond this customization.
  * The default value for `statefulset.podSecurityContext` is an empty object `{}`, meaning no security context is applied unless the user explicitly defines it.

### ⚠ BREAKING

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### Checklist

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- [X] Parameters are documented in the `values.yaml` and added to the `README.md` using [readme-generator-for-helm](https://github.com/bitnami-labs/readme-generator-for-helm)
- [X] Helm templating unittests are added (required when changing anything in `templates` folder)
- [X] All added template resources MUST render a namespace in metadata

Reviewed-on: https://gitea.com/gitea/helm-actions/pulls/62
Reviewed-by: DaanSelen <daanselen@noreply.gitea.com>
Co-authored-by: Stephen Sullivan <sjsullivan7@gmail.com>
Co-committed-by: Stephen Sullivan <sjsullivan7@gmail.com>

.gitea/workflows/changelog.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   changelog:
     runs-on: ubuntu-latest
-    container: docker.io/thegeeklab/git-sv:2.0.5
+    container: docker.io/thegeeklab/git-sv:2.0.6
     steps:
       - name: install tools
         run: |

.gitea/workflows/test-pr.yml

@@ -10,7 +10,7 @@ on:
 
 env:
   # renovate: datasource=github-releases depName=helm-unittest/helm-unittest
-  HELM_UNITTEST_VERSION: "v1.0.1"
+  HELM_UNITTEST_VERSION: "v1.0.3"
 
 jobs:
   check-and-test:

README.md

@@ -75,6 +75,7 @@ You should be good to go!
 | `statefulset.dind.extraVolumeMounts`      | Allows mounting extra volumes in the Docker-in-Docker container                                                                             | `[]`                           |
 | `statefulset.dind.extraEnvs`              | Allows adding custom environment variables, such as `DOCKER_IPTABLES_LEGACY`                                                                | `[]`                           |
 | `statefulset.persistence.size`            | Size for persistence to store act runner data                                                                                               | `1Gi`                          |
+| `statefulset.securityContext`             | Customize the SecurityContext                                                                                                               | `{}`                           |
 | `existingSecret`                          | Secret that contains the token                                                                                                              | `""`                           |
 | `existingSecretKey`                       | Secret key                                                                                                                                  | `""`                           |
 | `giteaRootURL`                            | URL the act_runner registers and connect with                                                                                               | `""`                           |

templates/statefulset.yaml

@@ -30,6 +30,8 @@ spec:
         {{- toYaml . | nindent 8 }}
         {{- end }}
     spec:
+      securityContext:
+        {{- toYaml .Values.statefulset.securityContext | nindent 8 }}
       initContainers:
         - name: init-gitea
           image: "{{ include "gitea.actions.init.image" . }}"

unittests/helm/statefulset.yaml

@@ -162,6 +162,60 @@ tests:
       - matchRegex:
           path: spec.template.spec.containers[0].env[8].name
           pattern: "GITEA_RUNNER_NAME"
+  - it: Has fsGroup in securityContext
+    template: templates/statefulset.yaml
+    set:
+      enabled: true
+      existingSecret: "my-secret"
+      existingSecretKey: "my-secret-key"
+      statefulset.securityContext:
+        fsGroup: 1000
+    asserts:
+      - hasDocuments:
+          count: 1
+      - containsDocument:
+          kind: StatefulSet
+          apiVersion: apps/v1
+          name: gitea-unittests-actions-act-runner
+      - equal:
+          path: spec.template.spec.securityContext["fsGroup"]
+          value: 1000
+  - it: Has fsGroupChangePolicy in securityContext
+    template: templates/statefulset.yaml
+    set:
+      enabled: true
+      existingSecret: "my-secret"
+      existingSecretKey: "my-secret-key"
+      statefulset.securityContext:
+        fsGroupChangePolicy: OnRootMismatch
+    asserts:
+      - hasDocuments:
+          count: 1
+      - containsDocument:
+          kind: StatefulSet
+          apiVersion: apps/v1
+          name: gitea-unittests-actions-act-runner
+      - equal:
+          path: spec.template.spec.securityContext["fsGroupChangePolicy"]
+          value: "OnRootMismatch"
+  - it: Has Always in securityContext
+    template: templates/statefulset.yaml
+    set:
+      enabled: true
+      existingSecret: "my-secret"
+      existingSecretKey: "my-secret-key"
+      statefulset.securityContext:
+        fsGroupChangePolicy: Always
+    asserts:
+      - hasDocuments:
+          count: 1
+      - containsDocument:
+          kind: StatefulSet
+          apiVersion: apps/v1
+          name: gitea-unittests-actions-act-runner
+      - equal:
+          path: spec.template.spec.securityContext["fsGroupChangePolicy"]
+          value: "Always"
   - it: doesn't renders a StatefulSet by default
     template: templates/statefulset.yaml
     asserts:

values.yaml

@@ -31,6 +31,7 @@
 ## @param statefulset.dind.extraVolumeMounts Allows mounting extra volumes in the Docker-in-Docker container
 ## @param statefulset.dind.extraEnvs Allows adding custom environment variables, such as `DOCKER_IPTABLES_LEGACY`
 ## @param statefulset.persistence.size Size for persistence to store act runner data
+## @param statefulset.securityContext Customize the SecurityContext
 ## @param existingSecret Secret that contains the token
 ## @param existingSecretKey Secret key
 ## @param giteaRootURL URL the act_runner registers and connect with
@@ -45,6 +46,7 @@ statefulset:
   tolerations: []
   affinity: {}
   extraVolumes: []
+  securityContext: {}
 
   actRunner:
     registry: "docker.gitea.com"