fix(buildah): define IMAGE shell variable from params to fix multi-arch builds

[ArthurVardevanyan]

User description

Summary

Fixes multi-arch build failures caused by undefined \${IMAGE} variable in the buildah task script.

Problem

Line 125 used \${IMAGE%:*} to extract the image name without the tag, but \${IMAGE} was never defined in the script. The task receives params: IMAGE, but the script referenced \${IMAGE} (undefined/empty) instead of \$(params.IMAGE).

This caused per-arch image names to be :amd64 and :arm64 (invalid references), which failed when buildah tried to create manifests.

Root cause in k8s-gitops-ci

This bug was masked in k8s-gitops-ci because the top-level params never set IMAGE_TAG for PR events, so IMAGE_TAG defaulted to "". This resulted in IMAGE being registry.arthurvardevanyan.com/homelab/k8s-gitops-ci: (with an empty tag), which exposed the bug when the buildah task tried to extract the image name.

Fix

Added IMAGE="$(params.IMAGE)" at the top of the script to resolve the IMAGE param into a shell variable. This is a single-source fix that covers all downstream \${IMAGE} usages (lines 137, 141, 153, 154, 180) which rely on the variable being defined.

Impact

• Fixes tag amd64:-amd64: invalid reference format errors in multi-arch builds
• No behavior change for single-arch builds (they don't use \${IMAGE})

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PR Type

Bug fix

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Description

• Define IMAGE shell variable from task parameters

• Fix invalid image reference errors in multi-arch builds

• Resolve undefined variable causing buildah manifest failures

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Diagram Walkthrough

flowchart LR
  P["params.IMAGE"]
  R["resolve_to_shell_var"]
  F["fix_invalid_refs"]
  S["success_multi_arch_build"]
  P -- "resolve" --> R
  R -- "fix" --> F
  F -- "result" --> S

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File Walkthrough

	Relevant files
Bug fix	buildah.yaml Define IMAGE shell variable from task parameters                  tekton/tasks/buildah/0.8.0/buildah.yaml Added IMAGE="$(params.IMAGE)" to resolve task parameter Included comment explaining the fix for string operations Placed variable definition before multi-arch detection logic +4/-0

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⚙️ Agent run details

• Model: openai/qwen3.6-35b-a3b
• Tokens: 4,662 in / 3,262 out / 7,924 total
• Time cost: 26.8s
• AI calls: 1

[homelab-okd]

GitOps CI Results

Last Updated: 2026-09-22T19:44:51Z

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✅ Expand: CI Notes

Pipeline completed.

• Tool version: k8s-gitops-ci version 0.60.0-rc.1

k8s-gitops-ci pipeline --url="https://github.com/ArthurVardevanyan/HomeLab" --pr=738 --assume-openshift

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⚙️ Agent run details

• Model: openai/qwen3.6-35b-a3b
• Tokens: 5,230 in / 1,211 out / 6,441 total
• Time cost: 9.1s
• AI calls: 1

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⚙️ Agent run details

• Model: openai/qwen3.6-35b-a3b
• Tokens: 4,157 in / 3,124 out / 7,281 total
• Time cost: 23.7s
• AI calls: 1