create continuous deployment workflow (opendistro-for-elasticsearch#15)

 Create goreleaser configuration to generate binary for multiple os and architecture.
Added github actions to generate binary and upload to github page when a
release tag is created. Later, we will be adding actions to upload
to s3 bucket to make this avaialabe for download page.

Author: VijayanB

.github/workflows/odfe-cli-publish-artifacts.yml

@@ -0,0 +1,55 @@
+name: Publish odfe-cli
+on:
+  push:
+    tags:
+      - v*
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Go ubuntu-latest
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.14
+
+      - name: Check out source code
+        uses: actions/checkout@v2
+
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v2
+        with:
+          version: latest
+          args: --snapshot --skip-publish
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Upload macOS(amd64) Artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: odfe-cli-macOS-amd64
+          path: dist/odfe-cli_darwin_amd64/odfe-cli
+
+      - name: Upload Linux(amd64) Artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: odfe-cli-linux-amd64
+          path: dist/odfe-cli_linux_amd64/odfe-cli
+
+      - name: Upload Linux(arm64) Artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: odfe-cli-linux-arm64
+          path: dist/odfe-cli_linux_arm64/odfe-cli
+
+      - name: Upload Windows(i386) Artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: odfe-cli-windows-386
+          path: dist/odfe-cli_windows_386/odfe-cli.exe
+
+      - name: Upload Windows(amd64) Artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: odfe-cli-windows-amd64
+          path: dist/odfe-cli_windows_amd64/odfe-cli.exe

.goreleaser.yml

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+# This is an example goreleaser.yaml file with some sane defaults.
+# Make sure to check the documentation at http://goreleaser.com
+project_name: odfe-cli
+dist: ./dist
+before:
+  hooks:
+    # You may remove this if you don't use go modules.
+    - go mod download
+builds:
+  - env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+    goarch:
+      - 386
+      - amd64
+      - arm
+      - arm64
+    ignore:
+      - goos: darwin
+        goarch: 386
+archives:
+  -
+    name_template: '{{ .ProjectName }}_{{ .Os }}_{{ .Arch }}{{ if .Arm }}v{{ .Arm }}{{ end }}'
+    replacements:
+      darwin: Darwin
+      linux: Linux
+      windows: Windows
+      386: i386
+      amd64: x86_64
+    format_overrides:
+      - goos: windows
+        format: zip
+checksum:
+  name_template: '{{ .ProjectName }}_checksums.txt'
+snapshot:
+  name_template: '{{ .ProjectName }}_{{ .Version }}'