Document PHP tool generation

doc/contributor/PHP-TOOL-install.yml.md

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+[PHP Tools: Overview](../../php_tools/README.md) |
+[PHP Tools: `options.yml`](PHP-TOOL-options.yml.md) |
+PHP Tools: `install.yml`
+
+---
+
+<h2><img name="Documentation" title="Documentation" width="20" src="https://github.com/devilbox/artwork/raw/master/submissions_logo/cytopia/01/png/logo_64_trans.png"> Contributor Documentation: PHP Tools</h2>
+
+
+
+# Tool definition: `install.yml`

doc/contributor/PHP-TOOL-options.yml.md

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+[PHP Tools: Overview](../../php_tools/README.md) |
+PHP Tools: `options.yml` |
+[PHP Tools: `install.yml`](../doc/contributor/PHP-TOOL-install.yml.md)
+
+---
+
+<h2><img name="Documentation" title="Documentation" width="20" src="https://github.com/devilbox/artwork/raw/master/submissions_logo/cytopia/01/png/logo_64_trans.png"> Contributor Documentation: PHP Tools</h2>
+
+
+
+# Tool definition: `options.yml`

php_tools/README.md

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+PHP Tools: Overview |
+[PHP Tools: `options.yml`](../doc/contributor/PHP-TOOL-options.yml.md) |
+[PHP Tools: `install.yml`](../doc/contributor/PHP-TOOL-install.yml.md)
+
+---
+
+<h2><img name="Documentation" title="Documentation" width="20" src="https://github.com/devilbox/artwork/raw/master/submissions_logo/cytopia/01/png/logo_64_trans.png"> Contributor Documentation: PHP Tools</h2>
+
+
+
+# PHP Tool definitions
+
+This document describes how to create new or alter existing PHP tools.
+
+All PHP tools (for all PHP versions and both for `amd64` and `arm64` platforms) are defined in the `php_tools/` directory in their corresponding sub directory. Tools defined in there will be built for the `work` flavour.
+
+**Directory Structure:**
+```bash
+php_tools/
+└── <php-tool>/
+    ├── install.yml
+    ├── options.yml
+    └── README.md
+```
+
+
+### Requirements
+
+In order to create new or altere existing PHP tools you need to have the following tools installed locally:
+* Python3
+* Python [`PyYAML`](https://pypi.org/project/PyYAML/) module
+* Docker
+* The `make` command
+
+Additionally you should have a brief understanding about what flavours exist and how they derive from each other: **[Documentation: Flavours](../doc/flavours.md)**.
+
+
+## How to add PHP tools?
+
+Simply add your new tool definitions into `php_tools/` as shown in the above directory structure.
+
+You can either look at existing tools to find out what needs to be added to `install.yml` and `options.yml` or you check out the documentation for that:
+
+* See **[PHP-TOOL-install.yml.md](../doc/contributor/PHP-TOOL-install.yml.md)** how to alter the `install.yml` file.
+* See **[PHP-TOOL-options.yml.md](../doc/contributor/PHP-TOOL-options.yml.md)** how to alter the `options.yml` file.
+
+Below is a simple example of how the `yq` tool was created:
+
+```bash
+# Enter the php_tools directory
+cd php_tools/
+
+# Create the yq directory
+mkdir yq
+
+# Create necessary empty files
+touch yq/install.yml
+touch yq/options.yml
+```
+
+Now let's edit `options.yml`:
+```yaml
+---
+name: yq       # The name must match the directory name
+exclude: []    # Any PHP versions to exclude?
+
+depends: [jq]  # The jq tool must be installed (yq depends on it)
+```
+
+Now let's edit the `install.yml`:
+```yaml
+---
+check: yq --version 2>&1 | grep -E '[0-9][.0-9]+' || (yq --version; false)
+
+all:
+  type: pip
+  version:
+  build_dep: []
+  run_dep: []
+  pre:
+  post:
+```
+
+
+## How to generate the Dockerfiles?
+
+Dockerfiles are generated for all PHP versions with a single `make` command. If you do not specify any arguments, then all PHP tools found in the `php_tools/` directory are being added to the Dockerfiles.
+
+You can however also generate Dockerfiles only containing the tool that you have created/altered. This makes the `docker build` process much faster and you can troubleshoot potential errors quicker.
+
+### Generate Dockerfiles for all PHP tools
+
+Inside the root of this git repository execute the following:
+```bash
+# Generate Dockerfiles with all available PHP tools found in php_tools/ dir
+make gen-dockerfiles
+```
+
+### Generate Dockerfiles for a single PHP tool
+
+Inside the root of this git repository execute the following:
+```bash
+# Generate Dockerfiles with only yq tool
+make gen-dockerfiles PHP_TOOLS="yq"
+```
+
+> **🛈 Note:** This will also add any tools that `yq` depends on (specified via `depends:` in `options.yml`)
+
+You can also exlcude any dependent tools by specifying the `-i` flag.
+
+```bash
+# Generate Dockerfiles with only yq tool and no dependent tools
+make gen-dockerfiles PHP_TOOLS="-i yq"
+```
+
+> **⚠ Warning:** The `-i` option might break your build.
+
+### Generate Dockerfiles for multiple PHP tools
+
+Inside the root of this git repository execute the following:
+```bash
+# Generate Dockerfiles with only yq and zsh tool
+make gen-dockerfiles PHP_TOOLS="yq zsh"
+```
+
+> **🛈 Note:** This will also add any tools that `yq` and `zsh` depends on (specified via `depends:` in `options.yml`)
+
+You can also exlcude any dependent tools by specifying the `-i` flag.
+
+```bash
+# Generate Dockerfiles with only yq and zsh tool and no dependent tools
+make gen-dockerfiles PHP_TOOLS="-i yq zsh"
+```
+
+
+## How to build the Dockerfiles?
+
+Once you have generated the Dockerfiles, pick a PHP version and an architecture (`linux/am64` or `linux/arm64`) and then build it via `make`.
+
+> **🛈 Note 1:** PHP tools are generated into Dockerfiles of the `work` flavour, so you will have to use `STAGE=work` to build this flavour.<br/>
+> **🛈 Note 2:** The `work` flavour depends on the `slim` flavour, so you need to ensure to either pull this Docker image or build it yourself.
+
+The following example will show the build for:
+* PHP version: `8.1`
+* Architecture: `linux/amd64`
+
+### Ensure to have `slim` flavour
+
+Either build it yourself for the specific PHP version and architecture.
+```bash
+make build STAGE=slim VERSION=8.1 ARCH=linux/amd64
+```
+Or pull it from Dockerhub
+```
+make docker-pull-base-image STAGE=work VERSION=8.1 ARCH=linux/amd64
+```
+
+### Build the `work` flavour
+
+This flavour will include the PHP tools you have generated above.
+```bash
+make build STAGE=work VERSION=8.1 ARCH=linux/amd64
+```