ci: migrate unittests

.woodpecker/lint.yml

@@ -32,6 +32,15 @@ pipeline:
       - apk add --no-cache helm
       - helm template --debug gitea-helm .
 
+  helm-unittests:
+    image: alpine:3.17.1
+    pull: true
+    commands:
+      - apk add --no-cache make helm git bash
+      - helm plugin install https://github.com/heyhabito/helm-unittest
+      - helm dependency update
+      - make unittests
+
   verify-readme:
     image: alpine:3.17.1
     pull: true