build: Automate bumping starship brew formula

.github/workflows/workflow.yml

@@ -127,7 +127,7 @@ jobs:
       # Install PHP at a fixed version
       - uses: shivammathur/setup-php@master
         with:
-          php-version: '7.3.8'
+          php-version: "7.3.8"
 
       # Install Mercurial (pre-installed on linux, installed from pip on macos
       # and from choco on windows),
@@ -139,7 +139,7 @@ jobs:
       - name: Install Mercurial (windows)
         if: matrix.os == 'windows-latest'
         run: choco install hg
-      
+
       # Install Terraform at a fixed version
       - uses: volcano-coffee-company/setup-terraform@v1
         with:
@@ -187,6 +187,21 @@ jobs:
     env:
       CRATES_IO_TOKEN: ${{ secrets.CRATES_IO_TOKEN }}
 
+  update_brew_formula:
+    if: startsWith(github.ref, 'refs/tags/v')
+    name: Update Brew Formula
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v1
+      - run: |
+          echo "https://starship-bot:$GITHUB_TOKEN@github.com" > ~/.git-credentials
+          git config --global credential.helper store
+          git config --global user.name "Starship Bot"
+          git config --global user.email "bot@starship.rs"
+          brew bump-formula-pr --url=https://github.com/starship/starship/archive/$(git describe --tags).tar.gz --message="Automated release pull request using continuous integration." --no-browse -v starship --force
+        env:
+          GITHUB_TOKEN: ${{ secrets.HOMEBREW_GITHUB_API_TOKEN }}
+
   # Build sources for every OS
   github_build:
     if: startsWith(github.ref, 'refs/tags/v')