Migrate data generation workflow to YAML (#44203)

.github/main.workflow

@@ -1,10 +0,0 @@
-workflow "Push" {
-  on = "push"
-  resolves = ["Generate formulae.brew.sh"]
-}
-
-action "Generate formulae.brew.sh" {
-  uses = "docker://linuxbrew/brew"
-  runs = ".github/main.workflow.sh"
-  secrets = ["ANALYTICS_JSON_KEY", "FORMULAE_DEPLOY_KEY"]
-}

.github/main.workflow.sh

@@ -1,59 +0,0 @@
-#!/bin/bash
-
-set -e
-
-# silence bundler complaining about being root
-mkdir ~/.bundle
-echo 'BUNDLE_SILENCE_ROOT_WARNING: "1"' > ~/.bundle/config
-
-# configure git
-git config --global user.name "BrewTestBot"
-git config --global user.email "homebrew-test-bot@lists.sfconservancy.org"
-
-# create stubs so build dependencies aren't incorrectly flagged as missing
-for i in python svn unzip xz
-do
-  touch /usr/bin/$i
-  chmod +x /usr/bin/$i
-done
-
-# setup Homebrew/homebrew-core instead of Linuxbrew's
-CORE_DIR="$(brew --repo homebrew/core)"
-mkdir -p "$CORE_DIR"
-rm -rf "$CORE_DIR"
-ln -s "$PWD" "$CORE_DIR"
-
-# get latest Homebrew/homebrew-core
-git -C "$CORE_DIR" fetch
-git -C "$CORE_DIR" checkout -f master
-git -C "$CORE_DIR" reset --hard origin/master
-
-# setup Homebrew environment
-export HOMEBREW_NO_AUTO_UPDATE=1
-export HOMEBREW_NO_ANALYTICS=1
-export HOMEBREW_FORCE_HOMEBREW_ON_LINUX=1
-export PATH="$(brew --repo)/Library/Homebrew/vendor/portable-ruby/current/bin:$PATH"
-
-# setup SSH
-mkdir ~/.ssh
-chmod 700 ~/.ssh
-echo "$FORMULAE_DEPLOY_KEY" > ~/.ssh/id_ed25519
-chmod 600 ~/.ssh/id_ed25519
-git config --global core.sshCommand "ssh -i ~/.ssh/id_ed25519 -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no"
-
-# clone formulae.brew.sh with SSH so we can push back
-git clone git@github.com:Homebrew/formulae.brew.sh
-cd formulae.brew.sh
-
-# setup analytics
-echo "$ANALYTICS_JSON_KEY" > ~/.homebrew_analytics.json
-unset HOMEBREW_NO_ANALYTICS
-
-# run rake (without a rake binary)
-ruby -e "load Gem.bin_path('rake', 'rake')"
-
-# commit and push generated files
-git add _data/formula api/formula formula
-git diff --exit-code HEAD -- _data/analytics _data/formula api/formula formula cask && exit 0
-git commit -m 'formula: update from Homebrew/homebrew-core push' _data/analytics _data/formula api/formula formula
-git push

.github/workflows/generate_formulae.brew.sh_data.yml

@@ -0,0 +1,42 @@
+name: Generate formulae.brew.sh data.
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  generate:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@master
+      - uses: Homebrew/actions/git-ssh@master
+        with:
+          git_user: BrewTestBot
+          git_email: homebrew-test-bot@lists.sfconservancy.org
+          key: ${{ secrets.FORMULAE_DEPLOY_KEY }}
+      - run: |
+          brew update-reset "$(brew --repository)"
+          brew tap "$GITHUB_REPOSITORY"
+          brew update-reset "$(brew --repository "$GITHUB_REPOSITORY")"
+
+          export PATH="$(brew --repo)/Library/Homebrew/vendor/portable-ruby/current/bin:$PATH"
+
+          git clone --depth=1 git@github.com:Homebrew/formulae.brew.sh
+          cd formulae.brew.sh
+
+          # setup analytics
+          echo "$ANALYTICS_JSON_KEY" > ~/.homebrew_analytics.json
+
+          # run rake (without a rake binary)
+          ruby -e "load Gem.bin_path('rake', 'rake')"
+
+          # commit and push generated files
+          git add _data/formula api/formula formula
+
+          if ! git diff --exit-code HEAD -- _data/analytics _data/formula api/formula formula cask; then
+            git commit -m "formula: update from ${GITHUB_REPOSITORY} push" _data/analytics _data/formula api/formula formula
+            git push
+          fi
+        env:
+          ANALYTICS_JSON_KEY: ${{ secrets.ANALYTICS_JSON_KEY }}