Add platform transition to main_image

Author: hartikainen

examples/bzlmod/multi-platform/BUILD.bazel

@@ -1,3 +1,4 @@
+load("@aspect_bazel_lib//lib:transitions.bzl", "platform_transition_filegroup")
 load("@aspect_rules_py//py:defs.bzl", "py_image_layer")
 load("@rules_oci//oci:defs.bzl", "oci_image", "oci_load")
 load("@rules_python//python:defs.bzl", "py_binary")
@@ -19,7 +20,7 @@ py_binary(
 )
 
 oci_image(
-    name = "main_image",
+    name = "_main_image",
     base = "@docker_io_python",
     entrypoint = ["/app/main"],
     tars = py_image_layer(
@@ -29,6 +30,20 @@ oci_image(
     ),
 )
 
+platform_transition_filegroup(
+    name = "main_image",
+    srcs = [":_main_image"],
+    target_platform = select({
+        "@platforms//cpu:arm64": "//platforms:linux_arm64",
+        "@platforms//cpu:x86_64": "//platforms:linux_x86_64",
+    }),
+)
+
+# alias(
+#     name = "main_image",
+#     actual = "_main_image",
+# )
+
 oci_load(
     name = "main_image.load",
     image = ":main_image",

examples/bzlmod/multi-platform/MODULE.bazel

@@ -5,6 +5,7 @@ module(
     version = "0.0.1",
 )
 
+bazel_dep(name = "aspect_bazel_lib", version = "2.19.4")
 bazel_dep(name = "rules_python", version = "1.5.1")
 bazel_dep(name = "rules_oci", version = "2.2.6")
 bazel_dep(name = "platforms", version = "1.0.0")