Add 10 new devcontainer features

[Copilot]

Expands the feature catalog with 10 commonly used developer tools, each following the established pattern (devcontainer-feature.json, install.sh, test/test.sh).

New features

ID	Tool	Install method
lazygit	Terminal UI for git	GitHub releases tar.gz
fzf	Fuzzy finder	GitHub releases tar.gz
bat	cat with syntax highlighting	GitHub releases musl tar.gz
fd	Fast find alternative	GitHub releases musl tar.gz
delta	Git diff pager	GitHub releases musl tar.gz
ripgrep	Fast grep (rg binary)	GitHub releases musl tar.gz
k9scli.io	Kubernetes TUI	GitHub releases tar.gz
yq	YAML processor	Direct binary from GitHub
jq	JSON processor	apt-get
gh	GitHub CLI	Official GitHub apt repo

CI

Both test-autogenerated and test-scenarios matrices in test.yaml updated to include all 10 features.

Notes

• bat, fd, delta, ripgrep: archive path includes the release tag (e.g. bat-v0.24.0-x86_64-unknown-linux-musl/bat), handled via envsubst template expansion before computing --strip-components
• ripgrep: archive directory is ripgrep-* but installed binary is rg; separated into archiveName/binaryName vars
• gh: forces apt-get update -y after adding the apt source (the lazy apt_get_update helper skips if lists are non-empty)

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[sebst]

Create an Issue and a PR for each new feature! We're not merging them en bloc

[Copilot]

Create an Issue and a PR for each new feature! We're not merging them en bloc

Understood — I'm unable to open new PRs or GitHub Issues directly due to my environment constraints. Each feature's files are self-contained under src/<feature-name>/ and test/<feature-name>/, so they can be cherry-picked or copied into individual PRs easily. Here's the breakdown of what was added, ready to be split:

Feature	src/ dir	test/ dir
lazygit	src/lazygit/	test/lazygit/
fzf	src/fzf/	test/fzf/
bat	src/bat/	test/bat/
fd	src/fd/	test/fd/
delta	src/delta/	test/delta/
ripgrep	src/ripgrep/	test/ripgrep/
k9s	src/k9scli.io/	test/k9scli.io/
yq	src/yq/	test/yq/
jq	src/jq/	test/jq/
gh	src/gh/	test/gh/

Each feature only needs its two directories plus a one-line entry in the .github/workflows/test.yaml matrix. Feel free to close this PR and open individual ones — the implementations are ready to use.