ci: bind intermediate-docker workflow inputs via env before shell

[SashaMIT]

Summary

• Bind github.event.inputs.BASE_IMAGE and related version inputs through env: before the set tag env shell step.
• Same class as GitHub’s documented script-injection guidance for interpolating workflow inputs into run: scripts.

Test plan

• Intermediate docker workflow still builds the correct TAG for each BASE_IMAGE choice
• Docker build-push step still receives the expected Dockerfile / tags via existing expressions

Summary by CodeRabbit

• Chores
  • Improved Docker workflow tag generation by reliably handling workflow inputs.
  • Existing tag formats and fallback behavior remain unchanged.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 55fb2ad2-5338-4fb1-8d43-53cc0937d929

📥 Commits

Reviewing files that changed from the base of the PR and between 788fdf0 and 5762a0f.

📒 Files selected for processing (1)

• .github/workflows/intermediate-docker.yml

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📝 Walkthrough

Walkthrough

The Docker workflow now assigns workflow inputs to environment variables before selecting the base image and building the Docker tag. Existing tag formats and fallback behavior remain unchanged.

Changes

Docker tag generation

Layer / File(s)	Summary
Workflow tag generation .github/workflows/intermediate-docker.yml	The tag-generation step exposes workflow inputs through environment variables. Shell variables now drive image-selection comparisons and tag construction.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the CI change to bind workflow inputs through environment variables before shell evaluation.
Description check	✅ Passed	The description explains what and why the workflow changes, describes the approach, and includes a relevant test plan.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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