ensure that oras discover doesn't error when the remote image doesn't exist

[hgarvison]

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[yonzhan]

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[Copilot]

Pull Request Overview

This PR updates the package to gracefully handle missing policy fragments in remote images and prepares a new 1.2.7 release.

• Add a warning branch in oras_proxy.discover to avoid errors when no fragments are found remotely.
• Bump versions to 1.2.7 (setup.py) and update internal config and history.
• Enhance case_insensitive_dict_get with a default value parameter and expand test coverage (emptyDir mounts, tarball fragment generation).

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/confcom/setup.py	Bumped package version to 1.2.7
src/confcom/azext_confcom/data/internal_config.json	Updated internal_config.json version to 1.2.6
src/confcom/azext_confcom/oras_proxy.py	Handle “not found” stderr with a warning instead of an error
src/confcom/azext_confcom/template_util.py	Added default_value parameter to case_insensitive_dict_get
src/confcom/azext_confcom/tests/latest/test_confcom_scenario.py	Updated expected image layer digests
src/confcom/azext_confcom/tests/latest/test_confcom_policy_conversion.py	Added test for emptyDir volume mounts
src/confcom/azext_confcom/tests/latest/test_confcom_fragment.py	Added tarball-based fragment generation test
src/confcom/azext_confcom/tests/latest/README.md	Registered new test_tar_file_fragment scenario
src/confcom/HISTORY.rst	Added 1.2.7 release notes

Comments suppressed due to low confidence (3)

src/confcom/azext_confcom/template_util.py:47

• [nitpick] Consider adding or updating the docstring to explain the new 'default_value' parameter and its behavior when the key is not found.

def case_insensitive_dict_get(dictionary, search_key, default_value=None) -> Any:

src/confcom/azext_confcom/oras_proxy.py:82

• Add a unit test for the code path where a 'not found' error is detected to ensure the warning branch is covered by tests.

        elif "not found" in item.stderr.decode("utf-8"):

src/confcom/azext_confcom/tests/latest/test_confcom_fragment.py:10

• The 'deepdiff' import appears unused in this test; consider removing it to clean up dependencies.

import deepdiff

[Copilot]

The version in setup.py (1.2.7) is inconsistent with internal_config.json which is at 1.2.6; ensure both are aligned to avoid version mismatches.

[Copilot]

The internal_config.json version (1.2.6) does not match setup.py (1.2.7); update this to reflect the same version.

Suggested change

	"version": "1.2.6",
	"version": "1.2.7",

[Copilot]

[nitpick] Matching the 'not found' substring in stderr may catch unrelated errors; consider using a more precise check or inspecting the exit code for a 404.

Suggested change

	elif "not found" in item.stderr.decode("utf-8"):
	elif item.returncode == 404: