test: use official unittest plugin (#410)

### Description of the change

Switch to official `helm-unittest` which is now alive again at https://github.com/helm-unittest/helm-unittest

### Applicable issues

- ref #199

### Checklist

<!-- [Place an '[X]' (no spaces) in all applicable fields. Please remove unrelated fields.] -->

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

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/410
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.io>
Reviewed-by: pat-s <pat-s@noreply.gitea.io>
Co-authored-by: Michael Kriese <michael.kriese@visualon.de>
Co-committed-by: Michael Kriese <michael.kriese@visualon.de>

.drone.yml

@@ -28,7 +28,7 @@ steps:
   image: alpine:3.17
   commands:
   - apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/testing make helm git bash
-  - helm plugin install https://github.com/heyhabito/helm-unittest
+  - helm plugin install https://github.com/helm-unittest/helm-unittest
   - helm dependency update
   - make unittests
 

CONTRIBUTING.md

@@ -56,7 +56,7 @@ be used:
 
 ```bash
 # install the unittest plugin
-$ helm plugin install https://github.com/heyhabito/helm-unittest
+$ helm plugin install https://github.com/helm-unittest/helm-unittest
 
 # run the unittests
 make unittests

Makefile

@@ -9,4 +9,4 @@ readme: prepare-environment
 
 .PHONY: unittests
 unittests:
-	helm unittest --helm3 --strict -f 'unittests/**/*.yaml' ./
+	helm unittest --strict -f 'unittests/**/*.yaml' ./

unittests/init/init_directory_structure.sh.yaml

@@ -10,7 +10,7 @@ tests:
       signing.enabled: true
     asserts:
       - equal:
-          path: stringData.[configure_gpg_environment.sh]
+          path: stringData["configure_gpg_environment.sh"]
           value: |-
             #!/usr/bin/env bash
             set -eu
@@ -19,7 +19,7 @@ tests:
   - it: skips gpg script block for disabled signing
     asserts:
       - equal:
-          path: stringData.[init_directory_structure.sh]
+          path: stringData["init_directory_structure.sh"]
           value: |-
             #!/usr/bin/env bash
 
@@ -40,7 +40,7 @@ tests:
       signing.enabled: true
     asserts:
       - equal:
-          path: stringData.[init_directory_structure.sh]
+          path: stringData["init_directory_structure.sh"]
           value: |-
             #!/usr/bin/env bash