Fix broken install Makefile target, update README

[mclasmeier]

• Fixes the install Makefile target (it was broken before).
• Mention it in the README.
• Reorganize the install instructions in the README
• Update some parts of the README: Use --tag/-t instead of MAIN_IMAGE_TAG, don't reference outdated ACS versions.

Summary by CodeRabbit

• Documentation

  • Updated installation instructions with multiple deployment paths including local development and CI environments
  • Updated deployment examples from version 4.9.2 to 4.11.0
  • Added native executable deployment guidance with component selection options

• Chores

  • Improved build system binary installation configuration

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yml

Review profile: CHILL

Plan: Enterprise

Run ID: 15584105-3570-45be-855c-092f3f1ec2c2

📥 Commits

Reviewing files that changed from the base of the PR and between fda0eb1 and 22c1a2c.

📒 Files selected for processing (1)

• README.md

📝 Walkthrough

Walkthrough

The Makefile install target is rewritten to derive GOPATH from go env GOPATH, compute an explicit INSTALLED_BINARY path, and build ./cmd directly into that path instead of using go install. The README expands installation instructions into subsections and updates example deployment tags from 4.9.2 to 4.11.0.

Changes

Install target fix and README update

Layer / File(s)	Summary
Makefile install target rewrite Makefile	Adds GOPATH (defaulting to go env GOPATH) and INSTALLED_BINARY ($(GOPATH)/bin/$(BINARY_NAME)) variables; rewrites install target to mkdir -p the destination and go build -o $(INSTALLED_BINARY) from ./cmd with existing LDFLAGS, replacing go install.
README installation docs and version tags README.md	Splits the installation section into subsections for local dev (latest release and source build), CI, and container image; rewrites Option 2 quick-start as "Deploying using native executable" with ./roxie deploy -t 4.11.0; bumps all example deployment tags from 4.9.2 to 4.11.0 including multi-cluster steps.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• stackrox/roxie#207: Updates README.md installation and quick-start documentation with GitHub-release and container-based install examples, directly overlapping with this PR's README changes.

Poem

🐇 Hippity-hop, no go install today,
I build the binary my own special way!
GOPATH resolved, the destination is clear,
mkdir -p first, then drop the files here.
The README got shinier, version bumped too —
4.11.0 now, and the docs feel brand new! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the two main changes: fixing the broken install Makefile target and updating the README documentation.
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.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch mc/fix-install-target

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[coderabbitai]

Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@README.md`:
- Line 101: The comment referencing the `MAIN_IMAGE_TAG` environment variable is
outdated since the example above now uses the `-t` flag approach (deploy -t
4.11.0). Update the line that says "Specify the `MAIN_IMAGE_TAG` as desired" to
reflect the current `-t` flag method, or remove it entirely if the approach is
self-evident from the example above.
- Line 99: The README documentation examples uniformly use version 4.11.0, but
the codebase default for `defaultMainImageTag` in internal/helpers/tag.go is set
to 4.9.2, creating a mismatch. Update the `defaultMainImageTag` constant to
4.11.0 to align the code default with the documented examples. This ensures
consistency so users who follow README examples or omit the version flag receive
the same version as the documentation shows.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yml

Review profile: CHILL

Plan: Enterprise

Run ID: 64d6dac7-41f4-4681-a146-d2ebedab86f8

📥 Commits

Reviewing files that changed from the base of the PR and between b91d393 and fda0eb1.

📒 Files selected for processing (2)

• Makefile
• README.md

[dcaravel]

LGTM