Address PR#16 feedback: terminology, consolidation, and security improvements

[Copilot]

Resolves reviewer feedback from netdata#16.

Terminology & Versioning

• Renamed netdata_release_version → netdata_release_channel with support for stable, edge, nightly (normalized to edge)
• Changed role_version from 1.0.0 → 0.1.0 (pre-1.0 versioning)

Security

• Added explicit GPG key ID 9DD4A74CECFA8F4F to apt_key task to prevent MITM attacks

Efficiency

• New handler uses netdatacli reload-claiming-state instead of full service restart for claiming config updates

Code Consolidation

• Merged install-ubuntu.yml into install-debian.yml (identical, both use apt)
• Removed empty vars/main.yml
• Removed .gitignore (personal convenience only)
• Removed default insecure = 'no' from claim.conf.j2
• Removed unnecessary charts.d.conf configuration block (enabled by default)

Fixes

• Restored period in CODEOWNERS first line
• Fixed operator precedence in distribution conditionals
• Added error handling to reload handler

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/ansible/ansible-lint/releases/latest
  • Triggering command: /home/REDACTED/.local/bin/ansible-lint ansible-lint --version (http block)
  • Triggering command: /home/REDACTED/.local/bin/ansible-lint ansible-lint --exclude tests/test.yml --skip-list=role-name (http block)
• repo.netdata.cloud
  • Triggering command: /usr/bin/curl curl -s REDACTED (dns block)
  • Triggering command: /usr/bin/curl curl -sL REDACTED (dns block)
  • Triggering command: /usr/bin/wget wget -q REDACTED -O netdata.key (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Resolve the PR feedback from netdata#16

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