macOS clippy (#526)

* Specifically use bash as a shell to try and get rustup to work on Windows

* Use bash for the call to echo

* Add macOS clippy

* Debug why git diff failed

* Restore macos-latest to matrix

* Allow whitespace before the fact 0 lines were modified

* Add LC_ALL env variable to grep

* Replace usage of -P with -e

.github/workflows/lint.yml

@@ -11,7 +11,7 @@ jobs:
   clippy:
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
 
     steps:
@@ -37,7 +37,8 @@ jobs:
       # The above clippy run will cause it to be updated, so checking there's
       # no differences present now performs the desired check
       - name: Verify lockfile
-        run: git diff | wc -l | grep -x "0"
+        shell: bash
+        run: git diff | wc -l | LC_ALL="en_US.utf8" grep -x -e "^[ ]*0"
 
   deny:
     runs-on: ubuntu-latest