Improve readme [skip ci]

Author: midwan

README.md

@@ -1,13 +1,31 @@
 # amiberry-docker-fedora-x86_64
 
-A Dockerfile which creates an image, with the requirements to build Amiberry for a Fedora `x86_64` platform.
+A Dockerfile which creates an image with all requirements to build Amiberry for a Fedora `x86_64` platform.
 
 The image is based on Fedora:latest and includes all Amiberry dependencies (e.g. SDL2, SDL2-image, etc)
 
 The full image is available on DockerHub: <https://hub.docker.com/repository/docker/midwan/amiberry-fedora-x86_64>
 
 ## Usage
 
-`docker run --rm -it -v <dir-you-cloned-amiberry-into>:/build midwan/amiberry-fedora-x84_64:latest`
+```bash
+docker run --rm -it -v <dir-you-cloned-amiberry-into>:/build midwan/amiberry-fedora-x84_64:latest
+```
 
-Then you can proceed to compile Amiberry as usual, e.g. `cmake -B build && cmake --build build`
+Then you can proceed to compile Amiberry as usual, e.g.:
+
+```bash
+cmake -B build && cmake --build build
+```
+
+## Building the image locally
+
+To build the image yourself:
+
+```bash
+docker build -t amiberry-fedora-x86_64:latest .
+```
+
+## CI/CD
+
+Images are automatically built and pushed to DockerHub via GitHub Actions on every push to `main` and on a daily schedule.