ci: add release workflow

- ref #2

.gitignore

@@ -1,3 +1,4 @@
 charts/
 node_modules/
 .DS_Store
+tmp/

.helmignore

@@ -30,3 +30,5 @@ Makefile
 .markdownlint.yaml
 .drone.yml
 CONTRIBUTING.md
+.woodpecker/
+tmp/

.woodpecker/lint.yml

@@ -1,10 +1,9 @@
 platform: linux/amd64
 
 when:
-  event: [ push, pull_request ]
   branch:
     exclude:
-      - main
+      - pages
 
 pipeline:
   helm-lint:

.woodpecker/release-version.yml

@@ -0,0 +1,25 @@
+platform: linux/amd64
+
+depends_on:
+  - lint
+
+when:
+  tag: v*
+
+pipeline:
+  generate-chart:
+    image: alpine:3.17
+    pull: true
+    commands:
+      - apk add --no-cache -X http://dl-cdn.alpinelinux.org/alpine/edge/testing helm
+      - apk add --no-cache curl
+      - helm dependency update
+      - rm -rf tmp/
+      - helm package --version "${CI_COMMIT_TAG##v}" -d tmp/ ./
+      - git fetch origin
+      - git checkout pages
+      - helm repo index tmp/ --merge index.yaml
+      - mv -f tmp/* .
+      - git add -A
+      - 'git commit -m "chore: update charts to ${CI_COMMIT_TAG}"'
+      - git push origin pages