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/signing-enabled.yaml

@@ -18,7 +18,7 @@ tests:
           value: configure-gpg
       - equal:
           path: spec.template.spec.initContainers[2].command
-          value: ["/usr/sbin/configure_gpg_environment.sh"]
+          value: ["/usr/sbinx/configure_gpg_environment.sh"]
       - equal:
           path: spec.template.spec.initContainers[2].securityContext
           value:
@@ -34,7 +34,7 @@ tests:
           path: spec.template.spec.initContainers[2].volumeMounts
           value:
             - name: init
-              mountPath: /usr/sbin
+              mountPath: /usr/sbinx
             - name: data
               mountPath: /data
             - name: gpg-private-key