get rid of self-hosted macos

.github/workflows/ci.yaml

@@ -37,9 +37,7 @@ jobs:
   macos:
     strategy:
       matrix:
-        runs-on:
-          - macos-latest
-          - ['self-hosted', 'macOS', 'ARM64']
+        runs-on: macos-latest
         go:
           - '1.19'
     runs-on: ${{ matrix.runs-on }}
@@ -57,23 +55,6 @@ jobs:
         with:
           repository: Homebrew/brew
           path: homebrew
-      - name: Set up brew to install deps under temporary dir
-        if: matrix.runs-on != 'macos-latest' # set up local brew only on self-hosted
-        run: |
-          dir="${GITHUB_WORKSPACE}/homebrew"
-          cd "${dir}"
-
-          echo "Set up shellenv" >&2
-          env="$(./bin/brew shellenv)"
-          echo "${env}" | tee -a ${GITHUB_ENV}
-          eval "${env}"
-
-          echo "Set up paths" >&2
-          echo "${dir}/bin" | tee -a ${GITHUB_PATH}
-
-          echo "Brew update" >&2
-          brew update --force --quiet
-          chmod -R go-w "$(brew --prefix)/share/zsh"
       - name: Install dependencies
         run: |
           which brew