Add image role, support logging in to registries

roles/image/meta/argument_specs.yaml

@@ -0,0 +1,27 @@
+---
+argument_specs:
+  main:
+    description:
+      - Sets up podman image with systemd unit (quadlet)
+      - The image unit filename is `image_name` with / replaced by _
+    options:
+      image_name:
+        description: "The image FQIN (format registry/imagename:tag)"
+        type: str
+        required: true
+      image_creds:
+        description: Credentials used to authenticate with the registry
+        type: dict
+        required: false
+        default:
+          username: ""
+          password: ""
+        options:
+          username:
+            description: Username
+            type: str
+            required: true
+          password:
+            description: Password
+            type: str
+            required: true