Gpg init fails to import key (#371)

### Description of the change

The init container for gpg key import doesn´t work. There is a not a tty error.

### Benefits

This will run gpg in batch mode. Eliminating the tty error.

### Possible drawbacks

None that I can think off.

### Applicable issues

  - fixes #370

### Checklist

- [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] Breaking changes are documented in the `README.md`

Co-authored-by: Jeroen Verhoeven <jeroen@joentje.org>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/371
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.io>
Co-authored-by: dajoen74 <dajoen74@noreply.gitea.io>
Co-committed-by: dajoen74 <dajoen74@noreply.gitea.io>

templates/gitea/init.yaml

@@ -10,7 +10,7 @@ stringData:
     #!/usr/bin/env bash
     set -eu
 
-    gpg --import /raw/private.asc
+    gpg --batch --import /raw/private.asc
   init_directory_structure.sh: |-
     #!/usr/bin/env bash
 

unittests/init/init_directory_structure.sh.yaml

@@ -5,6 +5,17 @@ release:
 templates:
   - templates/gitea/init.yaml
 tests:
+  - it: runs gpg in batch mode
+    set:
+      signing.enabled: true
+    asserts:
+      - equal:
+          path: stringData.[configure_gpg_environment.sh]
+          value: |-
+            #!/usr/bin/env bash
+            set -eu
+
+            gpg --batch --import /raw/private.asc
   - it: skips gpg script block for disabled signing
     asserts:
       - equal: