github-workflows: temporarily disable manual building on maxOS

Change-Id: I606a22b17e5c2df6065e32e8f53d90eccb91c707
diff --git a/.github/workflows/check-mac.yaml b/.github/workflows/check-mac.yaml
index 8ff8cb6..45c505e 100644
--- a/.github/workflows/check-mac.yaml
+++ b/.github/workflows/check-mac.yaml
@@ -12,7 +12,7 @@
       fail-fast: false
       matrix:
         config:
-        - { os: macOS-latest, r: '4.0' }
+        - { os: macOS-latest, r: '4.0', args: "--no-manual" }
 
     env:
       R_REMOTES_NO_ERRORS_FROM_WARNINGS: true
@@ -31,7 +31,7 @@
         if: contains(matrix.config.args, 'no-manual') == false
 
       - name: Install system dependencies
-        if: runner.os == 'macOS'
+        if: runner.os == 'macOS' && contains(matrix.config.args, 'no-manual') == false
         run: |
           tlmgr install pdftexcmds