chore: update readme

more maintainance and descriptions

README.md

@@ -2,6 +2,12 @@
 
 > A Fedora CoreOS image with some development packages built in
 
+**about**
+
+- automatically staged updates
+- updates are applied on reboot
+- image is signed
+
 ## Switching to the image
 
 reset to a clean state
@@ -14,12 +20,40 @@ rebase to the image
 rpm-ostree rebase ostree-unverified-registry:ghcr.io/ii/corehost/corehost:stable
 ```
 (as root)
+and reboot
 
 then rebase to the signed version
 ```shell
 rpm-ostree rebase ostree-image-signed:docker://ghcr.io/ii/corehost/corehost:stable
 ```
 
+## Making changes
+
+to add new files to the file system add them hierarchically in the [./files/](./files/) directory.
+
+new packages are added in the [./Containerfile](./Containerfile) like so:
+
+```dockerfile
+RUN rpm-ostree override remove \
+  PACKAGE_TO_REMOVE_1 \
+  PACKAGE_TO_REMOVE_2 \
+  PACKAGE_TO_REMOVE_3 \
+  --install=PACKAGE_TO_INSTALL_1 \
+  --install=PACKAGE_TO_INSTALL_2 \
+  --install=PACKAGE_TO_INSTALL_3
+```
+
+services are enabled inline with `systemctl enable` and `systemctl disable`
+
+## No-time iteration
+
+given an image is built in CI and pushed
+
+```shell
+rpm-ostree upgrade
+rpm-ostree apply-live
+```
+
 ## Equinix Metal iPXE booting
 
 read [this doc](./equinix-metal-ipxe-boot/README.md)