add toolchain for aarch64 (UBC-Thunderbots#3460)

Author: Lmh-java

src/WORKSPACE

@@ -31,7 +31,8 @@ register_toolchains("//py_toolchain:py_toolchain")
 
 register_toolchains(
     "//py_toolchain:k8_jetson_nano_cross_compile_py_cc_toolchain",
-    "//py_toolchain:py_cc_toolchain_for_host_x86_64",
+    "//py_toolchain:py_cc_toolchain_host_x86_64",
+    "//py_toolchain:py_cc_toolchain_host_aarch64",
 )
 
 load("@rules_python//python:pip.bzl", "pip_parse")
@@ -417,7 +418,7 @@ register_toolchains(
 )
 
 new_local_repository(
-    name = "py_cc_toolchain_for_host_x86_64",
+    name = "py_cc_toolchain_host",
     build_file = "@//extlibs:py_cc_toolchain.BUILD",
     path = "/usr/include/python3.12/",
 )

src/py_toolchain/BUILD

@@ -22,7 +22,7 @@ toolchain(
 )
 
 toolchain(
-    name = "py_cc_toolchain_for_host_x86_64",
+    name = "py_cc_toolchain_host_x86_64",
     exec_compatible_with = [
         "@platforms//cpu:x86_64",
         "@platforms//os:linux",
@@ -31,13 +31,27 @@ toolchain(
         "@platforms//cpu:x86_64",
         "@platforms//os:linux",
     ],
-    toolchain = ":py_cc_toolchain_for_host_x86_64_data",
+    toolchain = ":py_cc_toolchain_host_data",
+    toolchain_type = "@rules_python//python/cc:toolchain_type",
+)
+
+toolchain(
+    name = "py_cc_toolchain_host_aarch64",
+    exec_compatible_with = [
+        "@platforms//cpu:aarch64",
+        "@platforms//os:linux",
+    ],
+    target_compatible_with = [
+        "@platforms//cpu:aarch64",
+        "@platforms//os:linux",
+    ],
+    toolchain = ":py_cc_toolchain_host_data",
     toolchain_type = "@rules_python//python/cc:toolchain_type",
 )
 
 py_cc_toolchain(
-    name = "py_cc_toolchain_for_host_x86_64_data",
-    headers = "@py_cc_toolchain_for_host_x86_64//:headers",
+    name = "py_cc_toolchain_host_data",
+    headers = "@py_cc_toolchain_host//:headers",
     libs = ":empty",
     python_version = "3.12",
 )