Add initial set of files for the first Open-Source version of the Symfony CLI

Author: fabpot

.github/workflows/releaser.yml

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+name: Release
+
+on:
+    pull_request:
+    push:
+
+permissions:
+    contents: write
+
+jobs:
+    releaser:
+        name: Release
+        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: Set AUTOUPDATE_CHANNEL on tags
+                run: echo "AUTOUPDATE_CHANNEL=stable" >> $GITHUB_ENV
+                if: startsWith(github.ref, 'refs/tags/v')
+            -
+                name: Prepare
+                run: go generate ./cmd/
+            -
+                name: Test
+                run: go test -v ./...
+            -
+                name: Run GoReleaser
+                uses: goreleaser/goreleaser-action@v2
+                with:
+                    version: latest
+                    args: release --rm-dist
+                env:
+                    GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+            -
+                name: Archive binaries
+                uses: actions/upload-artifact@v2
+                with:
+                    retention-days: 5
+                    path: dist

.gitignore

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+/dist
+/vendor

.goreleaser.yml

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+before:
+    hooks:
+        - go mod download
+
+changelog:
+  sort: desc
+  use: git
+  filters:
+    exclude:
+    - Merge branch
+    - Merge pull request
+
+builds:
+  - env:
+        - CGO_ENABLED=0
+    goos:
+        - linux
+        - windows
+        - darwin
+    goarch:
+        - 386
+        - amd64
+        - arm64
+    ignore:
+        - goos: windows
+          goarch: arm64
+        - goos: darwin
+          goarch: 386
+    main: ./cmd
+    binary: symfony
+    ldflags: -s -w -X 'main.channel={{ if index .Env "AUTOUPDATE_CHANNEL" }}{{ .Env.AUTOUPDATE_CHANNEL }}{{ else }}dev{{ end }}' -X 'main.buildDate={{ .Date }}' -X 'main.version={{ .Version }}'
+    flags:
+        - -trimpath
+
+archives:
+  - name_template: '{{ .ProjectName }}_{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'
+    format_overrides:
+    - goos: windows
+      format: zip
+    files:
+      - README.md
+      - LICENSE
+
+checksum:
+    name_template: 'checksums.txt'
+
+snapshot:
+    name_template: "next"
+
+universal_binaries:
+    - replace: true
+
+release:
+  footer: |
+    **Full Changelog**: https://github.com/symfony-cli/symfony-cli/compare/{{ .PreviousTag }}...{{ .Tag }}