Nightly: do not build on M1 macs

Until we figure out how to cross-compile.

[ci skip]

Author: gaborcsardi

.github/workflows/nightly.yaml

@@ -34,7 +34,7 @@ on:
         options:
         - 'yes'
         - 'no'
-        default: 'yes'
+        default: 'no'
       linux-arm64:
         description: 'Build arm64 Linux packages'
         required: true
@@ -229,7 +229,7 @@ jobs:
 
   macos-m1:
     runs-on: [macos-arm64]
-    if: ${{ github.event.inputs.macos-m1 == '' || github.event.inputs.macos-m1 == 'yes' }}
+    if: ${{ github.event.inputs.macos-m1 == 'yes' }}
     name: macos arm64 pak binaries
     env:
       RVERSIONS: "4.1-arm64 4.2-arm64 4.3-arm64 4.4-arm64"