fix(ci): eliminate SHA propagation flakiness in Core Contrib Test (#4305)

* fix(ci): eliminate SHA propagation flakiness in Core Contrib Test

Each Core Contrib Test job was doing two separate git operations for
the core repo: actions/checkout (uses GitHub internal API, always
works) and then tox installing packages via git+https:// (hits public
CDN, fails when SHA hasn't propagated yet).

Fix by setting per-package env vars (CORE_REPO_API, CORE_REPO_SDK,
CORE_REPO_SEMCONV, CORE_REPO_TEST_UTILS) in the CI workflow to point
at the already-checked-out local copy, eliminating the second network
clone entirely.

Backward compatible: when the new vars are unset (local dev), they
fall back to the existing git URL + subdirectory behavior.

Fixes #4304

Assisted-by: Claude Sonnet 4.6

* fix: restore version header dropped during rebase

Assisted-by: Claude Sonnet 4.6

* move CORE_REPO_* vars to top-level env block

Use github.workspace context instead of a shell step to set the
per-package local path env vars, as suggested in code review.

Assisted-by: Claude Sonnet 4.6

Author: MikeGoldsmith

.github/workflows/core_contrib_test_0.yml

@@ -20,6 +20,10 @@ env:
   CORE_REPO_SHA: ${{ inputs.CORE_REPO_SHA }}
   CONTRIB_REPO_SHA: ${{ inputs.CONTRIB_REPO_SHA }}
   PIP_EXISTS_ACTION: w
+  CORE_REPO_API: ${{ github.workspace }}/opentelemetry-python/opentelemetry-api
+  CORE_REPO_SDK: ${{ github.workspace }}/opentelemetry-python/opentelemetry-sdk
+  CORE_REPO_SEMCONV: ${{ github.workspace }}/opentelemetry-python/opentelemetry-semantic-conventions
+  CORE_REPO_TEST_UTILS: ${{ github.workspace }}/opentelemetry-python/tests/opentelemetry-test-utils
 
 jobs:
 

.github/workflows/generate_workflows_lib/src/generate_workflows_lib/core_contrib_test.yml.j2

@@ -20,6 +20,10 @@ env:
   CORE_REPO_SHA: ${% raw %}{{ inputs.CORE_REPO_SHA }}{% endraw %}
   CONTRIB_REPO_SHA: ${% raw %}{{ inputs.CONTRIB_REPO_SHA }}{% endraw %}
   PIP_EXISTS_ACTION: w
+  CORE_REPO_API: ${% raw %}{{ github.workspace }}{% endraw %}/opentelemetry-python/opentelemetry-api
+  CORE_REPO_SDK: ${% raw %}{{ github.workspace }}{% endraw %}/opentelemetry-python/opentelemetry-sdk
+  CORE_REPO_SEMCONV: ${% raw %}{{ github.workspace }}{% endraw %}/opentelemetry-python/opentelemetry-semantic-conventions
+  CORE_REPO_TEST_UTILS: ${% raw %}{{ github.workspace }}{% endraw %}/opentelemetry-python/tests/opentelemetry-test-utils
 
 jobs:
   {%- for job_data in job_datas %}

CHANGELOG.md

@@ -11,6 +11,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Fixed
+
+- Fix intermittent `Core Contrib Test` CI failures caused by GitHub git CDN SHA propagation lag by installing core packages from the already-checked-out local copy instead of a second git clone
+  ([#4305](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/4305))
+
 ## Version 1.40.0/0.61b0 (2026-03-04)
 
 ### Added

tox.ini

@@ -464,10 +464,10 @@ envlist =
 
 [testenv]
 test_deps =
-  opentelemetry-api@{env:CORE_REPO}\#egg=opentelemetry-api&subdirectory=opentelemetry-api
-  opentelemetry-semantic-conventions@{env:CORE_REPO}\#egg=opentelemetry-semantic-conventions&subdirectory=opentelemetry-semantic-conventions
-  opentelemetry-sdk@{env:CORE_REPO}\#egg=opentelemetry-sdk&subdirectory=opentelemetry-sdk
-  opentelemetry-test-utils@{env:CORE_REPO}\#egg=opentelemetry-test-utils&subdirectory=tests/opentelemetry-test-utils
+  opentelemetry-api@{env:CORE_REPO_API}
+  opentelemetry-semantic-conventions@{env:CORE_REPO_SEMCONV}
+  opentelemetry-sdk@{env:CORE_REPO_SDK}
+  opentelemetry-test-utils@{env:CORE_REPO_TEST_UTILS}
 deps =
   lint: -r dev-requirements.txt
   coverage: pytest
@@ -790,6 +790,10 @@ setenv =
   ; i.e: CORE_REPO_SHA=dde62cebffe519c35875af6d06fae053b3be65ec tox -e <env to test>
   CORE_REPO_SHA={env:CORE_REPO_SHA:main}
   CORE_REPO=git+https://github.com/open-telemetry/opentelemetry-python.git@{env:CORE_REPO_SHA}
+  CORE_REPO_API={env:CORE_REPO_API:{env:CORE_REPO}\#egg=opentelemetry-api&subdirectory=opentelemetry-api}
+  CORE_REPO_SDK={env:CORE_REPO_SDK:{env:CORE_REPO}\#egg=opentelemetry-sdk&subdirectory=opentelemetry-sdk}
+  CORE_REPO_SEMCONV={env:CORE_REPO_SEMCONV:{env:CORE_REPO}\#egg=opentelemetry-semantic-conventions&subdirectory=opentelemetry-semantic-conventions}
+  CORE_REPO_TEST_UTILS={env:CORE_REPO_TEST_UTILS:{env:CORE_REPO}\#egg=opentelemetry-test-utils&subdirectory=tests/opentelemetry-test-utils}
   UV_CONFIG_FILE={toxinidir}/tox-uv.toml
   PIP_CONSTRAINTS={toxinidir}/test-constraints.txt
   UV_BUILD_CONSTRAINT={toxinidir}/test-constraints.txt