feat: a new template sync

[jaygridley]

Description

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Small minor change not affecting the Ansible Role code (Github Actions Workflow, Documentation etc.)

This pull request introduces a major overhaul of the repository’s GitHub workflows and contribution documentation to modernize CI/CD, streamline chart testing and release processes, and improve contributor experience. It replaces legacy workflows with modular, maintainable alternatives, adds new issue and PR templates, and updates contribution guidelines to clarify semantic commit requirements and workflow steps.

CI/CD Pipeline Modernization

• Replaces legacy workflows (lint-test.yaml, pr-release.yaml) with a modular pipeline including new workflows for pull requests, cache warmup, metadata collection, and cleanup, supporting matrix builds and improved chart publishing. ([[1]](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-a8619735ff14304aa0514284f86ff5145b0a6bae2e76a37faeb0ad899a3d8db4R1-R173), [[2]](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-6a8c56c2e6d69c57863c75fdec1c35f447539d8f85f220dff958b5cbe50ca026R1-R57), [[3]](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-d91ee3d948fd7c2d1fedf6ed9a0ae084036f13e49f81a0ddc5f159d49ad6090eR1-R27), [[4]](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-513c002720dc7f7c795f241c64a0fa466fb8ac9364bff0cbf62a8e2690d36839R1-R38))
• Adds a cleanup workflow to remove Helm chart packages when PRs are closed, preventing stale artifacts. ([.github/workflows/cleanup.yamlR1-R38](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-513c002720dc7f7c795f241c64a0fa466fb8ac9364bff0cbf62a8e2690d36839R1-R38))
• Implements a metadata collector workflow to dynamically discover charts for matrix jobs. ([.github/workflows/metadata-collector.yamlR1-R27](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-d91ee3d948fd7c2d1fedf6ed9a0ae084036f13e49f81a0ddc5f159d49ad6090eR1-R27))
• Updates workflow job environments to use pinned action versions and newer Ubuntu runners for reliability and security. ([[1]](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-a8619735ff14304aa0514284f86ff5145b0a6bae2e76a37faeb0ad899a3d8db4R1-R173), [[2]](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-6a8c56c2e6d69c57863c75fdec1c35f447539d8f85f220dff958b5cbe50ca026R1-R57))

Issue and Pull Request Templates

• Adds structured issue templates for bug reports and feature requests, improving triage and information gathering. ([[1]](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-637f7b97bba458badb691a1557c3d4648686292e948dbe3e8360564378b653efR1-R111), [[2]](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-c6b098646bf32c644234bec14c2675ea2a3d9c2dc2df450a25aa0e7ff02323cdR1-R39))
• Updates the PR template to require semantic prefixes and clearer test descriptions, aligning with new contribution guidelines. ([.github/PULL_REQUEST_TEMPLATE.mdL3-R21](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-18813c86948efc57e661623d7ba48ff94325c9b5421ec9177f724922dd553a35L3-R21))
• Enables blank issues for flexibility in reporting. ([.github/ISSUE_TEMPLATE/config.ymlR1](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-1c0d972ee49103af56fd608a77a28e1eb12f6908f263f0f183d46868fdcd8ea2R1))

Contribution Documentation Improvements

• Revamps CONTRIBUTING.md to clarify the process, enforce semantic commit/PR prefixes, and detail pre-commit and documentation requirements. ([.github/CONTRIBUTING.mdL1-R22](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-98e64bc1cd2db9333c6effe87bbe0d6dfe8714aba4c6bde45aa037fe0796e44cL1-R22))

Removal of Legacy Workflows

• Removes outdated workflows for chart linting/testing and PR-based releases, replaced by the new modular pipeline. ([[1]](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-8ee75a42ccdffb28e750aba529bb689756d1773f5b5052e1ffea9486cf5fb2b7L1-L45), [[2]](https://github.com/lablabs/k8s-nodelocaldns-helm/pull/17/files#diff-393bfd25b194c197ee31a6be2a0eb11745b835e406138e0777cabda104cdf650L1-L68))

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References:
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11]

How Has This Been Tested?