ci: auto generate changelog

.chglog/CHANGELOG.tpl.md

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+{{ range .Versions }}
+<a name="{{ .Tag.Name }}"></a>
+## {{ if .Tag.Previous }}[{{ .Tag.Name }}]({{ $.Info.RepositoryURL }}/compare/{{ .Tag.Previous.Name }}...{{ .Tag.Name }}){{ else }}{{ .Tag.Name }}{{ end }} ({{ datetime "2006-01-02" .Tag.Date }})
+
+{{ range .CommitGroups -}}
+### {{ .Title }}
+
+{{ range .Commits -}}
+* {{ if .Scope }}**{{ .Scope }}:** {{ end }}{{ .Subject }}
+{{ end }}
+{{ end -}}
+
+{{- if .RevertCommits -}}
+### Reverts
+
+{{ range .RevertCommits -}}
+* {{ .Revert.Header }}
+{{ end }}
+{{ end -}}
+
+{{- if .NoteGroups -}}
+{{ range .NoteGroups -}}
+### {{ .Title }}
+
+{{ range .Notes }}
+{{ .Body }}
+{{ end }}
+{{ end -}}
+{{ end -}}
+{{ end -}}

.chglog/config.yml

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+style: github
+template: CHANGELOG.tpl.md
+info:
+  title: CHANGELOG
+  repository_url: https://github.com/argoproj/argo-rollouts
+options:
+  commits:
+    # filters:
+    #   Type:
+    #     - feat
+    #     - fix
+    #     - perf
+    #     - refactor
+  commit_groups:
+    # title_maps:
+    #   feat: Features
+    #   fix: Bug Fixes
+    #   perf: Performance Improvements
+    #   refactor: Code Refactoring
+  header:
+    pattern: "^(\\w*)(?:\\(([\\w\\$\\.\\-\\*\\s]*)\\))?\\:\\s(.*)$"
+    pattern_maps:
+      - Type
+      - Scope
+      - Subject
+  notes:
+    keywords:
+      - BREAKING CHANGE

.github/workflows/changelog.yml

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+name: Update Changelog
+on:
+  release:
+    types: [published]
+permissions:
+  contents: read
+
+jobs:
+  updateChangelog:
+    permissions:
+      contents: write  # for peter-evans/create-pull-request to create branch
+      pull-requests: write  # for peter-evans/create-pull-request to create a PR
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Update Changelog
+        run: |
+          curl -o git-chglog.tar.gz -L https://github.com/git-chglog/git-chglog/releases/download/v0.15.1/git-chglog_0.15.1_darwin_amd64.tar.gz
+          tar -zxvf git-chglog.tar.gz
+          chmod u+x git-chglog
+          ./git-chglog --sort semver -o CHANGELOG-AUTO.md v1.3.1..
+          rm git-chglog
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v4
+        with:
+          commit-message: update changelog
+          title: "docs: Update Changelog"
+          body: Update changelog to reflect release changes
+          branch: update-changelog
+          base: master