ci: add release workflow

- ref #2

.woodpecker/test.yml

@@ -1,31 +0,0 @@
-platform: linux/amd64
-
-when:
-  event: [ push, pull_request ]
-  branch:
-    exclude:
-      - main
-
-pipeline:
-  helm-lint:
-    image: alpine:3.17
-    pull: true
-    commands:
-      - apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/testing helm
-      - helm lint
-
-  helm-template:
-    image: alpine:3.17
-    pull: true
-    commands:
-      - apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/testing helm
-      - helm dependency update
-      - helm template --debug gitea-helm .
-
-  verify-readme:
-    image: alpine:3.17
-    pull: true
-    commands:
-      - apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/testing make npm git
-      - make readme
-      - git diff --exit-code --name-only README.md