feat(release): initial attempt at providing automatic builds

.github/workflows/build-and-release.yml

@@ -0,0 +1,53 @@
+---
+name: Build and Release
+on:
+  workflow_dispatch:
+    inputs:
+      gitRef:
+        description: "Git Ref"
+        required: true
+        default: "master"
+      prerelease:
+        Description: "Pre-release?"
+        require: true
+        default: "true"
+
+jobs:
+  build-and-release:
+    runs-on: macos-10.15
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.7
+      - uses: actions/setup-go@v2
+        with:
+          go-version: 1.16
+      - name: Generate plan.yml
+        run: >-
+          ./build-emacs-for-macos --plan --plan-file=plan.yml
+          ${{ github.event.inputs.gitRef }}
+      - name: Phow plan
+        run: cat plan.yml
+      - name: Check if release and asset already exist for given plan
+        id: check
+        continue-on-error: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: >-
+          go run ./cmd/github-release --plan plan.yml check
+      - name: Install dependencies
+        if: steps.check.outcome == 'failure'
+        run: >-
+          brew bundle
+      - name: Download and build Emacs
+        if: steps.check.outcome == 'failure'
+        run: >-
+          ./build-emacs-for-macos --plan-file=plan.yml
+      - name: Publish release
+        if: steps.check.outcome == 'failure'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: >-
+          go run ./cmd/github-release --plan plan.yml publish
+          --prerelease=${{ github.event.inputs.prerelease }}