[CI] Run check workflow on Ubuntu (#14534)

Author: andrewheard

.github/workflows/check.yml

@@ -15,7 +15,7 @@ jobs:
   check:
     # Don't run on private repo.
     if: github.repository == 'Firebase/firebase-ios-sdk'
-    runs-on: macos-14
+    runs-on: ubuntu-latest
     env:
       MINT_PATH: ${{ github.workspace }}/mint
     steps:
@@ -33,7 +33,13 @@ jobs:
         restore-keys: ${{ runner.os }}-mint-
 
     - name: Setup check
-      run:  scripts/setup_check.sh
+      run:  |
+        eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
+        scripts/setup_check.sh
 
     - name: Check
-      run:  scripts/check.sh --test-only
+      run:  |
+        eval "$(/home/linuxbrew/.linuxbrew/bin/brew shellenv)"
+        # Add Homebrew clang-format to first in PATH
+        export PATH="/home/linuxbrew/.linuxbrew/opt/clang-format/bin:$PATH"
+        scripts/check.sh --test-only

scripts/check.sh

@@ -290,7 +290,7 @@ python --version
 "${top_dir}/scripts/check_filename_spaces.sh"
 "${top_dir}/scripts/check_copyright.sh"
 "${top_dir}/scripts/check_test_inclusion.py"
-"${top_dir}/scripts/check_imports.swift"
+swift "${top_dir}/scripts/check_imports.swift"
 
 # Google C++ style
 lint_cmd=("${top_dir}/scripts/check_lint.py")