Adds Ubuntu/Debian native pkgs for newer versions

Adds instructions on how to install the newer versions of PHP with
native packages for Ubuntu and Debian-based distributions using the
repositories maintainened by Ondrej Sury.

.ruby-version

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+2.7.8

_posts/01-06-01-Linux-Setup.md

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+---
+isChild: true
+anchor:  linux_setup
+---
+
+## Linux Setup {#linux_setup_title}
+
+Most GNU/Linux distributions come with PHP available from the official repositories, but those packages usually are a little behind the current stable version. There are multiple ways to get newer PHP versions on such distributions. On Ubuntu and Debian-based GNU/Linux distributions, for instance, the best alternatives for native packages are provided and maintened by [Ondřej Surý][Ondrej Sury Blog], through his Personal Package Archive (PPA) on Ubuntu and DPA/bikeshed on Debian. Find instructions for each of these below. All that said, you can always use containers, compile the PHP Source code, etc.
+
+### Ubuntu-based distributions
+
+For Ubuntu distributions, the [PPA by Ondřej Surý][Ondrej Sury PPA] provides supported PHP versions along with many PECL extensions. To add this PPA to your system, perform the following steps in your terminal:
+
+1. First, add the PPA to your system's software sources using the command:
+
+   ```bash
+   sudo add-apt-repository ppa:ondrej/php
+   ```
+
+2. After adding the PPA, update your system's package list:
+
+   ```bash
+   sudo apt update
+   ```
+
+This will ensure that your system can access and install the latest PHP packages available in the PPA.
+
+#### Debian-based distributions
+
+For Debian-based distributions, Ondřej Surý also provides a [bikeshed][bikeshed] (Debian equivalent of a PPA). To add the bikeshed to your system and update it, follow these steps:
+
+1. Ensure that you have root access. If not, you might need to use `sudo` for the following commands.
+
+2. Update your system's package list:
+
+   ```bash
+   sudo apt-get update
+   ```
+
+3. Install `lsb-release`, `ca-certificates`, and `curl`:
+
+   ```bash
+   sudo apt-get -y install lsb-release ca-certificates curl
+   ```
+
+4. Download the signing key for the repository:
+
+   ```bash
+   sudo curl -sSLo /usr/share/keyrings/deb.sury.org-php.gpg https://packages.sury.org/php/apt.gpg
+   ```
+
+5. Add the repository to your system's software sources:
+
+   ```bash
+   sudo sh -c 'echo "deb [signed-by=/usr/share/keyrings/deb.sury.org-php.gpg] https://packages.sury.org/php/ $(lsb_release -sc) main" > /etc/apt/sources.list.d/php.list'
+   ```
+
+6. Finally, update your system's package list again:
+
+   ```bash
+   sudo apt-get update
+   ```
+
+With these steps, your system will be able to install the latest PHP packages from the bikeshed.
+
+[Ondrej Sury Blog]: https://deb.sury.org/
+[Ondrej Sury PPA]: https://launchpad.net/~ondrej/+archive/ubuntu/php
+[bikeshed]: https://packages.sury.org/php/