docs: update the containerfile for quadlet (#159)

### What does this PR do?

Using "pull" no longer works and requires a custom storage.conf

Instead, just remove the "pull" part as the OS will automatically try
and pull the image anyways on boot if it's not available.

### Screenshot / video of UI

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screenshots or screencasts showing the difference -->

N/A

### What issues does this PR fix or reference?

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repository (or from another issue tracker). -->

N/A

### How to test this PR?

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Signed-off-by: Charlie Drage <[email protected]>

docs/containerfile_guide.md

@@ -173,11 +173,6 @@ There are other non-official tools such as [podlet](https://github.com/k9withabo
 ```Dockerfile
 FROM quay.io/centos-bootc/fedora-bootc:eln
 
-# Pull the container
-# we specify /usr/lib/containers/storage as the root because we are running
-# podman in a container and we want to use the host's storage
-RUN podman --root=/usr/lib/containers/storage pull quay.io/bootc-extension/helloworld
-
 # Add the podman quadlet systemd service
 ADD helloworld.container /usr/share/containers/systemd/helloworld.container
 

examples/bootc-helloworld-quadlet-container/Containerfile

@@ -1,10 +1,5 @@
 FROM quay.io/centos-bootc/fedora-bootc:eln
 
-# Pull the container
-# we specify /usr/lib/containers/storage as the root because we are running
-# podman in a container and we want to use the host's storage
-RUN podman --root=/usr/lib/containers/storage pull quay.io/bootc-extension/helloworld
-
 # Add the podman quadlet systemd service
 ADD helloworld.container /usr/share/containers/systemd/helloworld.container