feat: make it configurable of the initContainers volume mount path for scripts (#848)

### Description of the change

Makes it configurable volume mount path for initContainers for init scripts

### Benefits

Configurable initContainers volumeMount path for init scripts

### Possible drawbacks

I don't think that there will be any drawbacks

### Applicable issues

- Fixes #847

Signed-off-by: Batuhan Apaydin <batuhan.apaydin@chainguard.dev>

Reviewed-on: https://gitea.com/gitea/helm-gitea/pulls/848
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.com>
Co-authored-by: developerguy <developerguy@noreply.gitea.com>
Co-committed-by: developerguy <developerguy@noreply.gitea.com>

unittests/helm/deployment/basic.yaml

@@ -73,3 +73,23 @@ tests:
             requests:
               cpu: 100ms
               memory: 100Mi
+  - it: Init containers have correct volumeMount path
+    template: templates/gitea/deployment.yaml
+    set:
+      initContainersScriptsVolumeMountPath: "/custom/init/path"
+    asserts:
+      - equal:
+          path: spec.template.spec.initContainers[*].volumeMounts[?(@.name=="init")].mountPath
+          value: "/custom/init/path"
+      - equal:
+          path: spec.template.spec.initContainers[*].volumeMounts[?(@.name=="config")].mountPath
+          value: "/custom/init/path"
+  - it: Init containers have correct volumeMount path if there is no override
+    template: templates/gitea/deployment.yaml
+    asserts:
+      - equal:
+          path: spec.template.spec.initContainers[*].volumeMounts[?(@.name=="init")].mountPath
+          value: "/usr/sbinx"
+      - equal:
+          path: spec.template.spec.initContainers[*].volumeMounts[?(@.name=="config")].mountPath
+          value: "/usr/sbinx"