Cleanup more GitHub Actions usage

Increase consistency between workflows, use more of our actions and
`@main`.

.github/workflows/docker.yml

@@ -15,7 +15,7 @@ jobs:
         version: ["16.04", "18.04", "20.04"]
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@main
         with:
           fetch-depth: 0
           persist-credentials: false
@@ -23,8 +23,8 @@ jobs:
         run: git fetch origin master
       - name: Build Docker image
         run: docker build -t brew --build-arg=version=${{matrix.version}} .
-      - name: Run brew test-bot
-        run: docker run --rm brew brew test-bot
+      - name: Run brew test-bot --only-setup
+        run: docker run --rm brew brew test-bot --only-setup
       - name: Deploy the tagged Docker image to GitHub
         if: startsWith(github.ref, 'refs/tags/')
         run: |

.github/workflows/doctor.yml

@@ -8,6 +8,10 @@ on:
       - Library/Homebrew/extend/os/diagnostic.rb
       - Library/Homebrew/extend/os/mac/diagnostic.rb
       - Library/Homebrew/os/mac/xcode.rb
+env:
+  HOMEBREW_DEVELOPER: 1
+  HOMEBREW_GITHUB_ACTIONS: 1
+  HOMEBREW_NO_AUTO_UPDATE: 1
 jobs:
   tests:
     strategy:
@@ -17,21 +21,10 @@ jobs:
     runs-on: ${{ matrix.version }}
     env:
       PATH: '/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin'
-      HOMEBREW_DEVELOPER: 1
-      HOMEBREW_NO_ANALYTICS: 1
-      HOMEBREW_NO_AUTO_UPDATE: 1
     steps:
-      - name: Update Homebrew
-        run: brew update-reset
-
-      - name: Set up Git repository
-        run: |
-          cd $(brew --repo)
-          git clean -ffdx
-          git fetch --prune --force origin master
-          git fetch --prune --force origin ${{github.sha}}
-          git checkout --force ${{github.sha}}
-          git log -1
+      - name: Set up Homebrew
+        id: set-up-homebrew
+        uses: Homebrew/actions/setup-homebrew@master
 
       - name: Run brew test-bot --only-cleanup-before
         run: brew test-bot --only-cleanup-before
@@ -42,9 +35,3 @@ jobs:
       - name: Run brew test-bot --only-cleanup-after
         if: always()
         run: brew test-bot --only-cleanup-after
-
-      - name: Cleanup
-        if: always()
-        run: |
-          find .
-          rm -rf *

.github/workflows/spdx.yml

@@ -1,31 +1,24 @@
 name: Update license data
-
 on:
+  pull_request:
+    paths:
+      - .github/workflows/spdx.yml
   schedule:
     - cron: '0 */12 * * *'
-
 jobs:
   spdx:
     if: github.repository == 'Homebrew/brew'
     runs-on: ubuntu-latest
-    env:
-      HOMEBREW_NO_ANALYTICS: 1
-      HOMEBREW_NO_AUTO_UPDATE: 1
     steps:
-      - name: Checkout
-        uses: actions/checkout@v2
+      - name: Set up Homebrew
+        id: set-up-homebrew
+        uses: Homebrew/actions/setup-homebrew@master
 
-      - name: Configure Git
+      - name: Configure Git user
         uses: Homebrew/actions/git-user-config@master
         with:
           username: BrewTestBot
 
-      - name: Setup Homebrew
-        run: |
-          HOMEBREW_REPOSITORY="$(brew --repo)"
-          rm -rf "$HOMEBREW_REPOSITORY"
-          ln -s "$GITHUB_WORKSPACE" "$HOMEBREW_REPOSITORY"
-
       - name: Update license data
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/tests.yml

@@ -4,6 +4,7 @@ on:
     branches: master
   pull_request: []
 env:
+  HOMEBREW_DEVELOPER: 1
   HOMEBREW_GITHUB_ACTIONS: 1
   HOMEBREW_NO_AUTO_UPDATE: 1
 jobs:
@@ -18,6 +19,11 @@ jobs:
       id: set-up-homebrew
       uses: Homebrew/actions/setup-homebrew@master
 
+    - name: Configure Git user
+      uses: Homebrew/actions/git-user-config@master
+      with:
+        username: BrewTestBot
+
     - name: Run brew test-bot --only-cleanup-before
       run: brew test-bot --only-cleanup-before
 
@@ -29,7 +35,7 @@ jobs:
 
     - name: Cache Bundler RubyGems
       id: cache
-      uses: actions/cache@master
+      uses: actions/cache@main
       with:
         path: ${{ steps.set-up-homebrew.outputs.gems-path }}
         key: ${{ runner.os }}-rubygems-${{ steps.set-up-homebrew.outputs.gems-hash }}
@@ -91,8 +97,6 @@ jobs:
 
     - name: Run brew update-tests
       run: |
-        git config --global user.name "BrewTestBot"
-        git config --global user.email "homebrew-test-bot@lists.sfconservancy.org"
         brew update-test
         brew update-test --to-tag
         brew update-test --commit=HEAD

Library/Homebrew/dev-cmd/tap-new.rb

@@ -58,24 +58,12 @@ module Homebrew
             matrix:
               os: [ubuntu-latest, macOS-latest]
           steps:
-            - name: Update Homebrew
-              run: brew update
-
-            - name: Set up Git repository
-              uses: actions/checkout@master
-
-            - name: Set up Ruby
-              if: matrix.os == 'ubuntu-latest'
-              uses: actions/setup-ruby@main
-              with:
-                ruby-version: '2.6'
-
             - name: Set up Homebrew
               uses: Homebrew/actions/setup-homebrew@master
 
             - name: Cache Homebrew Bundler RubyGems
               id: cache
-              uses: actions/cache@v1
+              uses: actions/cache@main
               with:
                 path: ${{ steps.set-up-homebrew.outputs.gems-path }}
                 key: ${{ runner.os }}-rubygems-${{ steps.set-up-homebrew.outputs.gems-hash }}