Nightly: skip macOS build on R-devel

Temporarily, until rig is fixed for macOS R-devel.

[ci skip]

Author: gaborcsardi

.github/workflows/nightly.yaml

@@ -93,7 +93,7 @@ jobs:
     if: ${{ github.event.inputs.macos == '' || github.event.inputs.macos == 'yes' }}
     name: macOS x86_64
     env:
-      RVERSIONS: "3.5 3.6 4.0 4.1 4.2 4.3-x86_64 4.4-x86_64 4.5-x86_64 4.6-x86_64"
+      RVERSIONS: "3.5 3.6 4.0 4.1 4.2 4.3-x86_64 4.4-x86_64 4.5-x86_64"
       RVERSION_DEFAULT: "4.5-x86_64"
     steps:
 
@@ -121,7 +121,7 @@ jobs:
         sudo rig add 4.3 --arch x86_64
         sudo rig add 4.4 --arch x86_64
         sudo rig add release --arch x86_64
-        sudo rig add devel --arch x86_64
+        # sudo rig add devel --arch x86_64
         rig default release
 
     - name: Install skopeo
@@ -148,7 +148,7 @@ jobs:
     if: ${{ github.event.inputs.macos-arm64 == '' || github.event.inputs.macos-arm64 == 'yes' }}
     name: macos arm64
     env:
-      RVERSIONS: "4.1-arm64 4.2-arm64 4.3-arm64 4.4-arm64 4.5-arm64 4.6-arm64"
+      RVERSIONS: "4.1-arm64 4.2-arm64 4.3-arm64 4.4-arm64 4.5-arm64"
       RVERSION_DEFAULT: "4.5-arm64"
 
     steps:
@@ -174,7 +174,7 @@ jobs:
         sudo rig add 4.3
         sudo rig add 4.4
         sudo rig add release
-        sudo rig add devel
+        # sudo rig add devel
         rig default release
 
     - name: Install skopeo