ci: add goreleaser

.github/workflows/releaser.yml

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+name: goreleaser
+
+on:
+  push:
+    tags:
+      - v*
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    env:
+      DOCKER_CLI_EXPERIMENTAL: "enabled"
+    steps:
+      - uses: docker/setup-qemu-action@v1
+      - uses: docker/setup-buildx-action@v1
+      - uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: actions/setup-go@v3
+        with:
+          go-version: '1.17'
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - uses: goreleaser/goreleaser-action@v2
+        with:
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          REPOSITORY_OWNER: ${{ github.repository_owner }}

.gitignore

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+
+dist/

.goreleaser.yaml

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+before:
+  hooks:
+    - go mod tidy
+builds:
+  - env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+    mod_timestamp: "{{ .CommitTimestamp }}"
+    ldflags:
+      - -s -w
+      - -X github.com/prometheus/common/version.Version={{.Version}}
+      - -X github.com/prometheus/common/version.Revision={{.Commit}}
+      - -X github.com/prometheus/common/version.Branch={{.Branch}}
+      - -X github.com/prometheus/common/version.BuildDate={{.Date}}
+archives:
+  - format_overrides:
+      - goos: windows
+        format: zip
+changelog:
+  skip: true
+dockers:
+  - image_templates:
+      - "ghcr.io/{{ .Env.REPOSITORY_OWNER }}/{{ .ProjectName }}:{{ .Version }}-amd64"
+    dockerfile: Dockerfile
+    use: buildx
+    build_flag_templates:
+      - --platform=linux/amd64
+      - --label=org.opencontainers.image.title={{ .ProjectName }}
+      - --label=org.opencontainers.image.version={{ .Version }}
+      - --label=org.opencontainers.image.created={{ time "2006-01-02T15:04:05Z07:00" }}
+      - --label=org.opencontainers.image.revision={{ .FullCommit }}
+  - image_templates:
+      - "ghcr.io/{{ .Env.REPOSITORY_OWNER }}/{{ .ProjectName }}:{{ .Version }}-arm64v8"
+    goarch: arm64
+    dockerfile: Dockerfile
+    use: buildx
+    build_flag_templates:
+      - --platform=linux/arm64/v8
+      - --label=org.opencontainers.image.title={{ .ProjectName }}
+      - --label=org.opencontainers.image.version={{ .Version }}
+      - --label=org.opencontainers.image.created={{ time "2006-01-02T15:04:05Z07:00" }}
+      - --label=org.opencontainers.image.revision={{ .FullCommit }}
+docker_manifests:
+  - name_template: ghcr.io/{{ .Env.REPOSITORY_OWNER }}/{{ .ProjectName }}:{{ .Version }}
+    image_templates:
+      - ghcr.io/{{ .Env.REPOSITORY_OWNER }}/{{ .ProjectName }}:{{ .Version }}-amd64
+      - ghcr.io/{{ .Env.REPOSITORY_OWNER }}/{{ .ProjectName }}:{{ .Version }}-arm64v8
+  - name_template: ghcr.io/{{ .Env.REPOSITORY_OWNER }}/{{ .ProjectName }}:latest
+    image_templates:
+      - ghcr.io/{{ .Env.REPOSITORY_OWNER }}/{{ .ProjectName }}:{{ .Version }}-amd64
+      - ghcr.io/{{ .Env.REPOSITORY_OWNER }}/{{ .ProjectName }}:{{ .Version }}-arm64v8

Dockerfile

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+FROM alpine:latest
+RUN apk --no-cache add ca-certificates
+COPY rtorrent_exporter /usr/local/bin/rtorrent_exporter
+USER guest
+EXPOSE 9135
+ENTRYPOINT [ "/usr/local/bin/rtorrent_exporter" ]
+CMD [ "" ]