TEMP: Disable all CI except macOS for debugging

This is a temporary commit to isolate macOS CI issues by
disabling all other CI workflows (Ubuntu, FreeBSD, Cygwin, Solaris).

To be reverted after macOS CI is fixed.

Author: tridge

.github/workflows/cygwin-build.yml

@@ -16,6 +16,7 @@ on:
 
 jobs:
   test:
+    if: false  # Temporarily disabled while debugging macOS CI
     runs-on: windows-2022
     name: Test rsync on Cygwin
     steps:

.github/workflows/freebsd-build.yml

@@ -16,6 +16,7 @@ on:
 
 jobs:
   test:
+    if: false  # Temporarily disabled while debugging macOS CI
     runs-on: ubuntu-latest
     name: Test rsync on FreeBSD
     steps:

.github/workflows/solaris-build.yml

@@ -16,6 +16,7 @@ on:
 
 jobs:
   test:
+    if: false  # Temporarily disabled while debugging macOS CI
     runs-on: ubuntu-latest
     name: Test rsync on Solaris
     steps:

.github/workflows/ubuntu-build.yml

@@ -16,6 +16,7 @@ on:
 
 jobs:
   test:
+    if: false  # Temporarily disabled while debugging macOS CI
     runs-on: ubuntu-latest
     name: Test rsync on Ubuntu
     steps: