(FM-8969) Parameterize arm64 architecture

Curl agent from `arm64` based directory when `uname -p` is arm.

Since this is the first macOS 12 ARM released, we install the latest version
from puppet6 nightly and skip the 6.x to 6.y test.

Author: joshcooper

task_spec/spec/acceptance/init_spec.rb

@@ -62,6 +62,8 @@ def log_output_errors(result)
                          '6.23.0'
                        when %r{osx-12-x86_64}
                          '6.27.1'
+                       when %r{osx-12-arm}
+                         'latest'
                        when %r{ubuntu-22.04}
                          'latest'
                        else
@@ -71,7 +73,7 @@ def log_output_errors(result)
     # platforms that only have nightly builds available. Once a platform
     # is released, it should be removed from this list.
     case target_platform
-    when %r{ubuntu-22.04}
+    when %r{ubuntu-22.04}, %r{osx-12-arm}
       puppet_6_collection = 'puppet6-nightly'
       puppet_7_collection = 'puppet7-nightly'
     else
@@ -83,7 +85,7 @@ def log_output_errors(result)
     # Once there a platform has been released more than once, it can be removed
     # from this list.
     multiple_puppet6_versions = case target_platform
-                                when %r{osx-12-x86_64}
+                                when %r{osx-12-x86_64}, %r{osx-12-arm}
                                   false
                                 when %r{ubuntu-22.04}
                                   false

tasks/install_shell.sh

@@ -675,7 +675,12 @@ case $platform in
     else
       filename="puppet-agent-${version}-1.osx${platform_version}.dmg"
     fi
-    download_url="${mac_source}/mac/${collection}/${platform_version}/x86_64/${filename}"
+
+    arch="x86_64"
+    if [[ $(uname -p) == "arm" ]]; then
+        arch="arm64"
+    fi
+    download_url="${mac_source}/mac/${collection}/${platform_version}/${arch}/${filename}"
     ;;
   *)
     critical "Sorry $platform is not supported yet!"