fix(ci): use main branch after merge

[0xstepit]

After merging a PR, the heighliner in the CI uses the tag as a git reference for the image to build. We want to use main or the e2e fail because use a wrong source for the binary.

Summary by CodeRabbit

• Chores
  • Improved resilience of the e2e testing workflow by adding fallback logic for source code reference determination when standard reference is unavailable.

[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

A fallback mechanism is added to the e2e-tests workflow's git-ref computation. The variable now references github.head_ref || github.ref_name to handle scenarios where head_ref is unavailable, improving resilience without modifying surrounding workflow steps.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflow Configuration .github/workflows/e2e-tests.yaml	Added fallback to git-ref computation using github.head_ref || github.ref_name to resolve references when head_ref is unavailable

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

• Single configuration line modified with standard fallback pattern
• No logic changes or side effects

Poem

🐰 A fallback so clever, so spry—
When head_ref fades, ref_name's nearby!
Resilient flows, no step left behind,
In workflows robust, such logic we find! 🌿

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch stepit/fix-e2e-main

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between a93a1d9 and 5409315.

📒 Files selected for processing (1)

• .github/workflows/e2e-tests.yaml (1 hunks)

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