Optimize UPF E2E image builds

[andybavier]

Summary

Address #1301 by avoiding the BESS image rebuild when a UPF pull request cannot affect BESS.

• Extends the existing pinned dorny/paths-filter job with an E2E-specific BESS-impact filter.
• Selects bess pfcp when the PR changes bess/, conf/, Dockerfile, .dockerignore, or requirements.txt.
• Otherwise selects pfcp, so the reusable workflow builds, deploys, and verifies only localhost:5000/pfcp:testing; the chart keeps its released BESS image.
• Pins the backward-compatible image_list input from the released shared workflow v0.0.32 at commit d57b6360a2cc92237c201f2bb9ad58b924ef7082.

The PFCP Docker target does not depend on the BESS build stage, so the PFCP-only path avoids the ~13-minute BESS compilation rather than merely omitting the BESS output.

Validation

• Parsed .github/workflows/main.yml with PyYAML.
• git diff --check.
• The earlier PR run exercised the PFCP-only path successfully; this update changes only the shared-workflow reference from its tested PR commit to the v0.0.32 release commit.
• actionlint reports only three existing unsupported permission scopes outside this change.

[gab-arrobo]

Why is .dockerignore included in this list?

[andybavier]

The thinking is that a change to .dockerignore can change the Docker build context, so build both images to be safe.

[Copilot]

🟢 Approval recommended

No unresolved review issues were identified.

Pull request overview

Optimizes UPF pull-request E2E builds by rebuilding BESS only when relevant files change.

Changes:

• Adds a BESS-impact path filter.
• Selects bess pfcp or pfcp for E2E workflows.
• Pins the reusable workflow to v0.0.32.

File summaries

File	Description
.github/workflows/main.yml	Adds path-based E2E image selection and reusable workflow input.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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