tests.yml: address review comments

.github/workflows/tests.yml

@@ -9,12 +9,15 @@ env:
 jobs:
   tests:
     if: github.repository == 'Homebrew/brew'
-    runs-on: ${{ matrix.config.os }}
+    runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        config:
-          - {os: ubuntu-latest, core-tap: 'linuxbrew-core'}
-          - {os: macOS-latest, core-tap: 'homebrew-core'}
+        os: [ubuntu-latest, macOS-latest]
+        include:
+          - os: ubuntu-latest
+            core-tap: 'linuxbrew-core'
+          - os: macOS-latest
+            core-tap: 'homebrew-core'
     steps:
     - name: Set up Homebrew
       id: set-up-homebrew
@@ -26,7 +29,9 @@ jobs:
         username: BrewTestBot
 
     - run: brew test-bot --only-cleanup-before
+
     - run: brew config
+
     - run: brew doctor
 
     - name: Cache Bundler RubyGems
@@ -96,14 +101,14 @@ jobs:
     - name: Run brew readall on all taps
       run: brew readall --aliases
 
-    - name: Run brew style on ${{ matrix.config.core-tap }}
+    - name: Run brew style on ${{ matrix.core-tap }}
       run: brew style --display-cop-names homebrew/core
 
     - name: Run brew style on official taps
       run: brew style --display-cop-names homebrew/bundle homebrew/services homebrew/test-bot
 
     - name: Run brew cask style on all taps
-      if: matrix.config.os == 'macOS-latest'
+      if: matrix.os == 'macOS-latest'
       run: |
         brew tap homebrew/cask
         brew tap homebrew/cask-drivers
@@ -121,13 +126,13 @@ jobs:
         vale docs/
 
     - name: Lint Dockerfile
-      if: matrix.config.os == 'ubuntu-latest'
+      if: matrix.os == 'ubuntu-latest'
       run: |
         brew install hadolint
         hadolint Dockerfile
 
     - name: Build Docker image
-      if: matrix.config.os == 'ubuntu-latest'
+      if: matrix.os == 'ubuntu-latest'
       run: docker build -t brew --build-arg=version=16.04 .
 
     - name: Run brew test-bot --only-formulae --test-default-formula
@@ -139,7 +144,7 @@ jobs:
         fi
 
     - name: Deploy the Docker image to GitHub and Docker Hub
-      if: matrix.config.os == 'ubuntu-latest' && github.ref == 'refs/heads/master'
+      if: matrix.os == 'ubuntu-latest' && github.ref == 'refs/heads/master'
       run: |
         docker login docker.pkg.github.com -u BrewTestBot -p ${{secrets.GITHUB_TOKEN}}
         docker tag brew "docker.pkg.github.com/homebrew/brew/ubuntu16.04:master"