ci: auto-update homebrew formula on release

Author: klaidliadon

.github/workflows/release.yml

@@ -29,7 +29,51 @@ jobs:
           args: release --clean
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          HOMEBREW_TAP_GITHUB_TOKEN: ${{ secrets.HOMEBREW_TAP_GITHUB_TOKEN }}
+
+  update-formula:
+    runs-on: ubuntu-latest
+    needs: goreleaser
+    steps:
+      - name: Update Homebrew formula
+        env:
+          TAG: ${{ github.ref_name }}
+          GH_TOKEN: ${{ secrets.HOMEBREW_TAP_GITHUB_TOKEN }}
+        run: |
+          VERSION="${TAG#v}"
+          URL="https://github.com/WarriorsCode/deck/archive/refs/tags/${TAG}.tar.gz"
+          SHA256=$(curl -sL "$URL" | sha256sum | cut -d' ' -f1)
+
+          FORMULA="class Deck < Formula
+            desc \"Lightweight local dev orchestrator\"
+            homepage \"https://github.com/WarriorsCode/deck\"
+            url \"${URL}\"
+            sha256 \"${SHA256}\"
+            license \"MIT\"
+
+            depends_on \"go\" => :build
+
+            def install
+              ldflags = \"-s -w -X github.com/warriorscode/deck.Version=#{version}\"
+              system \"go\", \"build\", *std_go_args(ldflags:), \"./cmd/deck\"
+            end
+
+            test do
+              system bin/\"deck\", \"--version\"
+            end
+          end"
+          # dedent
+          FORMULA=$(echo "$FORMULA" | sed 's/^          //')
+
+          # get current file sha
+          FILE_SHA=$(gh api repos/WarriorsCode/homebrew-tap/contents/Formula/deck.rb --jq '.sha' 2>/dev/null || echo "")
+
+          ARGS=(-f "message=formula: update deck to ${VERSION}")
+          ARGS+=(-f "content=$(echo "$FORMULA" | base64 -w0)")
+          if [ -n "$FILE_SHA" ]; then
+            ARGS+=(-f "sha=${FILE_SHA}")
+          fi
+
+          gh api -X PUT repos/WarriorsCode/homebrew-tap/contents/Formula/deck.rb "${ARGS[@]}"
 
   sync-docs:
     runs-on: ubuntu-latest