docs: improve README (#52)

Signed-off-by: Gabriele Bartolini <[email protected]>

.github/workflows/build-commitfest.yml

@@ -1,4 +1,4 @@
-name: Build Commitfest Container Images
+name: Container Images from Commitest patch
 
 on:
   workflow_dispatch:

.github/workflows/build.yml

@@ -1,4 +1,4 @@
-name: Build Postgres Container Images from sources
+name: Container Images from PostgreSQL sources
 
 on:
   workflow_dispatch:

README.md

@@ -1,18 +1,52 @@
-# E2E tests for PostgreSQL Trunk Container Images
+# Building PostgreSQL Container Images from the Development Trunk
 
-This repository contains a Continuous Delivery workflow which runs daily and that:
+This CloudNativePG project is designed to build PostgreSQL container images
+directly from the PostgreSQL source code, providing developers with a seamless
+way to test and deploy their patches in Kubernetes environments.
 
-* Builds the latest snapshot image of the main trunk of the PostgreSQL server
-* Runs the CloudNativePG E2E test suite using the latest main of the operator
+By default, these images are built from the `master` branch of the official
+PostgreSQL repository, commonly known as the *trunk*. However, you can also
+leverage additional workflows to:
 
-## License and copyright
+- Build images from a specific branch in any PostgreSQL repository publicly
+  accessible
+- Build images from a selected patch in a PostgreSQL Commitfest
 
-This software is available under [Apache License 2.0](LICENSE).
+Additionally, these container images can be used to run the suite of end-to-end
+(E2E) tests of CloudNativePG through the continuous delivery workflow.
 
-Copyright The CloudNativePG Contributors.
+The primary goal of this project is to provide daily feedback on the status of
+the PostgreSQL trunk, helping to identify and address regressions early in the
+development process.
+
+## How to Build a Container Image for Your PostgreSQL Patch
+
+If you are developing a patch for PostgreSQL and want a quick way to test it in
+Kubernetes with CloudNativePG, you can fork this project on GitHub. From there,
+navigate to the "Actions" menu and run the relevant workflow called "Container
+Images from PostgreSQL sources", specifying your Git repository and branch.
+
+The action summary provides all the details you need to effectively use the
+image.
+
+## How to Build a Container Image for a Patch in the Commitfest
+
+If you're interested in testing a PostgreSQL patch from a Commitfest in
+Kubernetes with CloudNativePG, you can fork this project on GitHub. Then, run
+the designated workflow called "Container Images from Commitfest patch" from the
+"Actions" menu, entering the Commitfest ID and patch ID.
+
+The action summary provides all the details you need to effectively use the
+image.
+
+## License and Copyright
+
+This software is licensed under the [Apache License 2.0](LICENSE).
+
+Copyright © The CloudNativePG Contributors.
 
 ## Trademarks
 
-*[Postgres, PostgreSQL and the Slonik Logo](https://www.postgresql.org/about/policies/trademarks/)
+*[Postgres, PostgreSQL, and the Slonik Logo](https://www.postgresql.org/about/policies/trademarks/)
 are trademarks or registered trademarks of the PostgreSQL Community Association
-of Canada, and used with their permission.*
+of Canada and are used with their permission.*