feat(ci): added CI workflows and GitHub automations

.github/CODEOWNERS

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+* @tagesspiegel/platform-engineers

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: gomod
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - dep/go
+      - dependabot
+  - package-ecosystem: docker
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - dep/docker
+      - dependabot
+  - package-ecosystem: github-actions
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    labels:
+      - dep/gh-actions
+      - dependabot

.github/pr-labeler.yml

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+# source: https://github.com/TimonVS/pr-labeler-action
+feature: ['feature/*', 'feat/*']
+enhancement: ['enhancement/*', 'enhance/*', "enh/*"]
+fix: ['fix/*', 'bugfix/*', "bug-fix/*"]
+documentation: ['docs/*', 'doc/*', 'documentation/*']
+chore: ['chore/*', 'ch/*']
+refactor: ['refactor/*', 'ref/*']

.github/pull_request_template.md

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+# Description
+
+Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.
+
+Fixes # (issue)
+
+## How Has This Been Tested?
+
+Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration
+
+- [ ] Test A
+- [ ] Test B
+
+**Test Configuration**:
+
+- Kubernetes version:
+- Kubectl version:
+- Node operation system:
+
+## Checklist
+
+- [ ] My code follows the style guidelines of this project
+- [ ] I have performed a self-review of my own code
+- [ ] I have commented my code, particularly in hard-to-understand areas
+- [ ] I have made corresponding changes to the documentation
+- [ ] My changes generate no new warnings

.github/workflows/pr_automation.yaml

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+name: Pull Request automations
+
+on: pull_request
+
+jobs:
+  size-label:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Add size label
+        uses: "pascalgn/[email protected]"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          IGNORED: ".gitignore\n*.md\n*.MD\n*.json\n*.sql\n*.yaml\n*.yml\n.dockerignore\ngo.mod\ngo.sum\nLICENSE"
+        with:
+          sizes: >
+            {
+              "0": "XS",
+              "50": "S",
+              "250": "M",
+              "500": "L",
+              "1000": "XL",
+              "2000": "XXL"
+            }
+
+  pr-labeler:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - uses: TimonVS/pr-labeler-action@v4
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/release.yaml

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+name: release
+
+on:
+  push:
+    tags:
+      - "v*"
+
+env:
+  go_version: "1.21"
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          clean: true
+      - run: git fetch --force --tags
+      - uses: actions/setup-go@v3
+        with:
+          go-version: ${{ env.go_version }}
+          cache: false
+      - run: go mod tidy
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v4
+        with:
+          distribution: goreleaser
+          version: latest
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/tests.yaml

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+name: testing
+
+on:
+  push:
+    branches:
+      - "**"
+
+env:
+  go_version: "1.21"
+
+jobs:
+  vetting:
+    name: vetting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          submodules: true
+          ref: ${{ github.ref }}
+
+      - uses: actions/setup-go@v4
+        with:
+          go-version: ${{ env.go_version }}
+
+      - name: vetting
+        shell: bash
+        run: go vet ./...
+
+  linting:
+    name: linting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          submodules: true
+          ref: ${{ github.ref }}
+
+      - uses: actions/setup-go@v4
+        with:
+          go-version: ${{ env.go_version }}
+
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v3
+        with:
+          version: latest
+          args: --timeout=3m --issues-exit-code=1 ./...
+          only-new-issues: true
+
+  unit-tests:
+    runs-on: ubuntu-latest
+    needs:
+      - vetting
+      - linting
+    env:
+      COVER_FILE: coverage.out
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-go@v3
+        with:
+          go-version: ${{ env.go_version}}
+      - run: go mod tidy
+      - name: Run unit tests
+        run: go test -coverprofile=$COVER_FILE -covermode=atomic ./...

.goreleaser.yaml

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+project_name: helm-plugin-bootstrap
+
+before:
+  hooks:
+    - go mod tidy
+
+builds:
+  - env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+
+archives:
+  - format: binary
+    # this name template makes the OS and Arch compatible with the results of uname.
+    name_template: >-
+      {{ .ProjectName }}_
+      {{- title .Os }}_{{ .Arch }}
+      {{- if .Arm }}v{{ .Arm }}{{ end }}
+
+release:
+  draft: false
+  prerelease: auto
+  name_template: "Release {{ .Tag }}"
+  mode: prepend
+  header: |
+    ## Release {{ .Tag }} on {{ .Date }}
+
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ incpatch .Version }}-next"
+
+changelog:
+  use: github
+  sort: asc
+  groups:
+    - title: Features
+      regexp: "^.*feat[(\\w)]*:+.*$"
+      order: 0
+    - title: "Bug fixes"
+      regexp: "^.*fix[(\\w)]*:+.*$"
+      order: 1
+    - title: "Enhancements"
+      regexp: "^.*enhancement[(\\w)]*:+.*$"
+      order: 2
+    - title: Others
+      order: 999
+  filters:
+    exclude:
+      - "^docs:"
+      - "^test:"
+      - "^Merge branch"
+      - "^chore(deps):"