Add LICENSE and GitHub Actions release workflow

.github/workflows/release.yml

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+name: goreleaser
+
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.17
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: release --rm-dist
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          HOMEBREW_TAP_GITHUB_TOKEN: ${{ secrets.HOMEBREW_TAP_GITHUB_TOKEN }}

.goreleaser.yml

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+before:
+  hooks:
+    - go mod tidy
+builds:
+  - env:
+      - CGO_ENABLED=0
+    mod_timestamp: "{{ .CommitTimestamp }}"
+    flags:
+      - -trimpath
+    ldflags:
+      - "-s -w -X main.version={{.Version}} -X main.commit={{.Commit}} -X main.date={{.Date}}"
+    goos:
+      - freebsd
+      - windows
+      - linux
+      - darwin
+    goarch:
+      - amd64
+      - "386"
+      - arm
+      - arm64
+    binary: docker-credential-env
+archives:
+  - format: zip
+    name_template: "{{ .ProjectName }}_{{ .Version }}_{{ .Os }}_{{ .Arch }}"
+snapshot:
+  name_template: "{{ .Tag }}-next"
+checksum:
+  name_template: "{{ .ProjectName }}_{{ .Version }}_SHA256SUMS"
+  algorithm: sha256
+release:
+  draft: false
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - "^docs:"
+      - "^test:"
+brews:
+  - tap:
+      owner: isometry
+      name: homebrew-tap
+      token: "{{ .Env.HOMEBREW_TAP_GITHUB_TOKEN }}"
+    folder: Formula
+    description: Environment-driven Docker credential helper
+    homepage: https://just.breathe.io/project/docker-credential-env/
+    test: |
+      system "#{bin}/docker-credential-env --version"
+    install: |
+      bin.install "docker-credential-env"

LICENSE

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+The MIT License (MIT)
+
+Copyright © 2021 Robin Breathe <[email protected]>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.