fix: resolve CI failures for egress policies and Python 3.7 buildpack support #388
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The conformance workflow was failing with ECONNREFUSED errors when trying to download Python binaries from GitHub releases. This was caused by the harden-runner egress policy blocking connections to the GitHub Actions CDN IP addresses. Added *.actions.githubusercontent.com:443 to the allowed endpoints to fix Python setup for all versions (3.7, 3.8, etc).
Google Cloud Buildpacks dropped Python 3.7 support for Ubuntu 22.04. The version is not available in their runtime manifest. Note: Functions Framework still supports Python 3.7, which is tested in unit and conformance tests using GitHub Actions with Ubuntu 20.04.
The Python binaries are actually hosted on release-assets.githubusercontent.com, not *.actions.githubusercontent.com
The same ECONNREFUSED issue was affecting multiple workflows with harden-runner egress policies
taeold
changed the title
maemayve
approved these changes
Jul 22, 2025
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Summary
Fixes CI/CD failures across multiple workflows due to egress policy blocking and buildpack version support issues.
Problems Fixed
1. ECONNREFUSED Errors in Multiple Workflows
The following workflows were failing with connection refused errors when downloading Python:
Error:
Root Cause: The harden-runner egress policies were blocking connections to GitHub's release assets CDN.
Solution: Added
release-assets.githubusercontent.com:443to the allowed endpoints in:.github/workflows/conformance.yml.github/workflows/unit.yml.github/workflows/conformance-asgi.yml2. Buildpack Integration Test - Python 3.7 Failure
The buildpack test was failing with:
Root Cause: Google Cloud Buildpacks dropped Python 3.7 support for Ubuntu 22.04. The version is not available in https://dl.google.com/runtimes/ubuntu2204/python/version.json
Solution: Removed Python 3.7 from buildpack integration tests. Note that Functions Framework still supports Python 3.7, which continues to be tested in unit and conformance tests.
Test Plan