Add release machinery

Add a go releaser config and a github job to automatically cut a release
when we push a tag

Author: Funcan

.github/workflows/release.yaml

@@ -0,0 +1,41 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "v[0-9]+.[0-9]+.[0-9]+"
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: "Existing tag to release (e.g. v0.0.1)"
+        required: true
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          ref: ${{ inputs.tag || github.ref }}
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Run tests
+        run: go test -v ./...
+
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v6
+        with:
+          version: latest
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GORELEASER_CURRENT_TAG: ${{ inputs.tag || '' }}

.goreleaser.yaml

@@ -0,0 +1,36 @@
+version: 2
+
+builds:
+  - main: .
+    binary: kubectl-metrics
+    env:
+      - CGO_ENABLED=0
+    ldflags:
+      - -s -w -X main.version={{.Version}}
+    goos:
+      - linux
+      - darwin
+      - windows
+    goarch:
+      - amd64
+      - arm64
+
+archives:
+  - format: binary
+    name_template: "{{ .ProjectName }}_{{ .Os }}_{{ .Arch }}"
+
+checksum:
+  name_template: checksums.txt
+
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - "^docs:"
+      - "^test:"
+      - "^ci:"
+
+release:
+  github:
+    owner: Funcan
+    name: kubectl-metrics