Improve Dev Container (#5423)

* Improve Dev Container
PHPStan was failing in Dev Container

* Update Docker to Alpine Linux 3.18
* New DATA_PATH environment variable

* README

1 files changed, 22 insertions, 0 deletions

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+# Dev Container for FreshRSS
+
+This is a [Development Container](https://containers.dev) to provide a one-click full development environment
+with all the needed tools and configurations, to develop and test [FreshRSS](https://github.com/FreshRSS/FreshRSS/).
+
+It can be used on your local machine (see for instance the [Dev Containers extension for Visual Studio Code](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers)),
+or as [GitHub Codespaces](https://github.com/features/codespaces) simply in a Web browser:
+
+[![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://github.com/codespaces/new?hide_repo_select=true&ref=edge&repo=6322699)
+
+## Test instance of FreshRSS
+
+A test instance of FreshRSS is automatically started as visible from the *Ports* tab: check the *Local Address* column, and click on the *Open in browser* 🌐 icon.
+It runs the FreshRSS code that you are currently editing.
+
+## Software tests
+
+Running the tests can be done directly from the built-in terminal, e.g.:
+
+```sh
+make test-all
+```