docs: pushing an image to a registry (#2969)

* docs: pushing an image to a registry

Signed-off-by: Fabrice Flore-Thébault <ffloreth@redhat.com>

* docs: implemented suggestions

Signed-off-by: Fabrice Flore-Thébault <ffloreth@redhat.com>

---------

Signed-off-by: Fabrice Flore-Thébault <ffloreth@redhat.com>

website/docs/getting-started/pushing-an-image-to-a-registry.md

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+---
+sidebar_position: 10
+title: Pushing an image to a registry
+description: Pushing an image to a registry.
+keywords: [podman desktop, podman, containers, image, registry, registries]
+tags: [images]
+---
+
+# Pushing an image to a registry
+
+With Podman Desktop, you can push an image to registries.
+
+#### Prerequisites
+
+- You have configured your registry **<icon icon="fa-solid fa-cog" size="lg" /> Settings > Registries**.
+- You have built an image, which name is the fully qualified name required for your registry, such as `quay.io/my-repository/my-image`, `ghcr.io/my-repository/my-image`, or `docker.io/my-repository/my-image`.
+  Ensure that the image name includes the registry where to publish the image. To publish on `quay.io/repository` the image `my-image`, the FQN image name should be `quay.io/repository/my-image`.
+
+#### Procedure
+
+1. Go to **<icon icon="fa-solid fa-cloud" size="lg" /> Images**.
+1. On your image line, click **<icon icon="fa-solid fa-ellipsis-v" size="lg" /> > <icon icon="fa-solid fa-arrow-up" size="lg" />Push Image**.
+1. Select the Image tag for your registry.
+1. Click **<icon icon="fa-solid fa-arrow-up" size="lg" />Push Image**.
+1. Click **Done**.
+
+#### Verification
+
+1. Go to your container registry.
+1. Find your image.