fix: resolve empty src_branch and src_tag in Konflux builds

[platex-rehor-bot]

Summary

• Root cause: get_git_branch() used git branch --show-current which returns an empty string (not an error) in detached HEAD state — the default checkout mode in Konflux/Tekton CI pipelines. The if ! guard only caught non-zero exit codes, so empty output was silently returned as the branch name.
• Fix: Refactored all three git helper functions (get_git_branch, get_git_tag, get_git_hash) to capture output into variables and check for empty values, with multiple fallback strategies for CI environments.
• Dockerfile: Added SOURCE_GIT_BRANCH and SOURCE_GIT_TAG build args so Tekton pipelines can optionally pass branch/tag metadata when git-based detection is not possible.

Branch detection cascade

1. git branch --show-current (regular checkout)
2. git rev-parse --abbrev-ref HEAD (non-detached ref)
3. git branch -r --points-at HEAD (remote branch at same commit)
4. CI environment variables (SOURCE_GIT_BRANCH, GITHUB_HEAD_REF, GITHUB_REF_NAME, GIT_BRANCH, BRANCH_NAME)
5. Fallback to "unknown"

Tag detection cascade

1. git describe --tags --abbrev=0 (nearest tag in history)
2. git tag --points-at HEAD (tag directly on current commit)
3. SOURCE_GIT_TAG environment variable
4. Fallback to "unknown"

Fixes RHCLOUD-43021

Test plan

• Verify app.info.json has correct src_branch and src_tag in a Konflux build
• Verify local Docker builds still produce correct metadata
• Verify no regressions in existing test_app_info_json_content test

🤖 Generated with Claude Code

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 5ab1dfcc-4114-4985-b100-8ef0fb466965

📥 Commits

Reviewing files that changed from the base of the PR and between 46fccd9 and e1aa068.

📒 Files selected for processing (2)

• Dockerfile
• build_app_info.sh

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🧪 Generate unit tests (beta)

• Create PR with unit tests

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