docs: [#10] update project dictionary and GitHub Copilot instructions

- Add infrastructure and networking terms to project-words.txt
- Update GitHub Copilot instructions with project context and conventions
- Improve documentation for the local testing environment setup

Author: josecelano

.github/copilot-instructions.md

@@ -3,19 +3,22 @@ This repository contains all the configuration needed to run the live Torrust Tr
 The main goal is to provide a simple and easy-to-use setup for the Torrust Tracker, which can be deployed on a single server.
 
 The current major initiative is to migrate the tracker to a new infrastructure on Hetzner. This involves:
+
 - Running the tracker binary directly on the host for performance.
 - Using Docker for supporting services like Nginx, Prometheus, Grafana and MySQL.
 - Migrating the database from SQLite to MySQL.
 
 When providing assistance, please act as an experienced open-source developer and system administrator.
 
 Follow these conventions:
+
 - Use Conventional Commits for commit messages. Include the issue number in this format `#1` in the commit message if applicable, e.g., `feat: [#1] add new feature`.
-    - The issue number should be the branch prefix, e.g., `feat: [#1] add new feature` for branch `1-add-new-feature`.
+  - The issue number should be the branch prefix, e.g., `feat: [#1] add new feature` for branch `1-add-new-feature`.
 - We use the proposed GitHub branch naming convention:
-    - Starts with a number indicating the issue number.
-    - Followed by a hyphen and a short description of the feature or fix.
-    - Uses hyphens to separate words, e.g., `1-add-new-feature`.
+  - Starts with a number indicating the issue number.
+  - Followed by a hyphen and a short description of the feature or fix.
+  - Uses hyphens to separate words, e.g., `1-add-new-feature`.
 - Ensure that shell scripts are POSIX-compliant.
 - Provide clear and concise documentation for any new features or changes.
 - Follow https://github.com/DavidAnson/markdownlint conventions for Markdown files.
+- Use https://github.com/koalaman/shellcheck for shell scripts to ensure they are free of common errors.

project-words.txt

@@ -8,7 +8,9 @@ commoninit
 dialout
 dmacvicar
 dnsmasq
+domifaddr
 dominfo
+domstate
 ECDH
 ethernets
 fullchain