diff --git a/.github/scripts/infra_build.py b/.github/scripts/infra_build.py
index c067f3054..a2ea9007b 100644
--- a/.github/scripts/infra_build.py
+++ b/.github/scripts/infra_build.py
@@ -82,6 +82,9 @@
 # What pip in an agent image's build answers for the agentenv-framework-protocol its release published moments earlier,
 # until PyPI's index, which a CDN caches, lists it: pinned (an agent's), or a floor it names (the browser's recorder).
 _NOT_YET_SERVED = re.compile(r"No matching distribution found for agentenv-framework-protocol(\[[^\]]*\])?(==|>=)")
+# What GHCR answers a push to a new package while another platform's push creates it, until it links the package to
+# this repository.
+_NOT_YET_LINKED = re.compile(r"denied: permission_denied: write_package")
 # How long to wait before each try again, so a burst of builds starting together spreads out.
 _RETRY_WAITS_SECONDS = (30, 60, 120)
 
@@ -308,13 +311,16 @@ def _tried_again(attempt: Callable[[], subprocess.CompletedProcess]) -> subproce
 
 def _why_again(result: subprocess.CompletedProcess) -> str | None:
     """Why a failed run can work later, or None: a registry rate-limited it, as public.ecr.aws does past one anonymous
-    pull a second, which builds starting together pass; or a build's pip can't find the agentenv-framework-protocol its
-    release has just published, which PyPI's index lists a little after the upload."""
+    pull a second, which builds starting together pass; a build's pip can't find the agentenv-framework-protocol its
+    release has just published, which PyPI's index lists a little after the upload; or GHCR refuses a push to a package
+    another platform's push is creating, as an image's first release pushes both at once."""
     printed, command = f"{result.stdout}{result.stderr}", f"`{' '.join(result.args)[:_PRINTED_CHARS]}`"
     if _RATE_LIMITED.search(printed):
         return f"a registry rate-limited {command}"
     if _NOT_YET_SERVED.search(printed):
         return f"PyPI doesn't list yet the agentenv-framework-protocol {command} installs"
+    if list(result.args[:2]) == ["docker", "push"] and _NOT_YET_LINKED.search(printed):
+        return f"GHCR doesn't let this repository write yet the package {command} pushes to"
     return None
 
 
diff --git a/tst/unit/test_infra_build_script.py b/tst/unit/test_infra_build_script.py
index 6bf1132da..5fa6b5020 100644
--- a/tst/unit/test_infra_build_script.py
+++ b/tst/unit/test_infra_build_script.py
@@ -463,6 +463,25 @@ def test_retry_tries_again_while_pypi_doesnt_list_the_protocol_floor_a_build_nam
     assert len(runs) == 2 and waits == [script._RETRY_WAITS_SECONDS[0]]
 
 
+def test_retry_tries_again_a_push_ghcr_refuses_while_another_platform_creates_the_package(script, monkeypatch, capsys):
+    """An image's first release pushes both platforms at once; the second waits on GHCR linking the new package."""
+    runs, waits = _attempts(script, monkeypatch, [("denied: permission_denied: write_package\n", 1), ("pushed\n", 0)])
+
+    assert _run(script, monkeypatch, "retry", "docker", "push", "img") == 0
+
+    assert len(runs) == 2 and waits == [script._RETRY_WAITS_SECONDS[0]]
+    assert ("::warning::GHCR doesn't let this repository write yet the package `docker push img` pushes to; trying again in"
+            in capsys.readouterr().out)
+
+
+def test_retry_doesnt_try_again_a_denied_command_that_isnt_a_push(script, monkeypatch, capsys):
+    runs, waits = _attempts(script, monkeypatch, [("denied: permission_denied: write_package\n", 1)])
+
+    assert _run(script, monkeypatch, "retry", "docker", "build", ".") == 1
+
+    assert len(runs) == 1 and waits == []
+
+
 def test_retry_doesnt_try_again_a_build_missing_another_package(script, monkeypatch, capsys):
     runs, waits = _attempts(script, monkeypatch, [("ERROR: No matching distribution found for nonexistent-pkg==1.0\n", 1)])