Release automation and release build testing

We will be using this automation which is triggered on every new tag created in this repo for the upcoming helmfile 0.145.0 release.

Signed-off-by: Yusuke Kuoka <ykuoka@gmail.com>

.github/workflows/publish_binaries.yaml

@@ -0,0 +1,29 @@
+name: Publish Binaries
+
+on:
+  push:
+    branches:
+      - "!*"
+    tags:
+      - "v*"
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v1
+      -
+        name: Set up Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: ~1.18.1
+      -
+        name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v1
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/test_binary_builds.yaml

@@ -0,0 +1,26 @@
+name: Test Binary Builds
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v1
+      -
+        name: Set up Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: ~1.18.1
+      -
+        name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v1
+        with:
+          version: latest
+          args: release --rm-dist --snapshot

.goreleaser.yml

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+project_name: helmfile
+builds:
+  - id: helmfile
+    main: .
+    env:
+      - CGO_ENABLED=0
+    ldflags:
+      - -s -w -X github.com/helmfile/helmfile/pkg/app/version.Version={{.Version}}
+    goos:
+      - darwin
+      - linux
+      - windows
+    goarch:
+      - amd64
+      - arm64
+      - "386"
+changelog:
+  use: github-native