add buildmetadata for ppc64le

The metadata was generated by:
./hack/update-rhcos-bootimage.py https://releases-art-rhcos.svc.ci.openshift.org/art/storage/releases/rhcos-4.5-ppc64le/45.81.202004021642-0/ppc64le/meta.json ppc64le

data/data/rhcos-ppc64le.json

@@ -0,0 +1,50 @@
+{
+    "baseURI": "https://releases-art-rhcos.svc.ci.openshift.org/art/storage/releases/rhcos-4.5-ppc64le/45.81.202004021642-0/ppc64le/",
+    "buildid": "45.81.202004021642-0",
+    "images": {
+        "initramfs": {
+            "path": "rhcos-45.81.202004021642-0-installer-initramfs.ppc64le.img",
+            "sha256": "e75359934e9c9969e7c444841fab9c67ffc2a0e302bfbcc68aab1a3ed3c31a4e"
+        },
+        "iso": {
+            "path": "rhcos-45.81.202004021642-0-installer.ppc64le.iso",
+            "sha256": "e9e707049ee7354d94b59d6fe4f4538cf1a3e2b066c9018d99e614543a4bda5c"
+        },
+        "kernel": {
+            "path": "rhcos-45.81.202004021642-0-installer-kernel-ppc64le",
+            "sha256": "5a78b5099da27cbe6d22032c8e55542c1b2885e8c1e69206f7fc390dae9897b7"
+        },
+        "metal": {
+            "path": "rhcos-45.81.202004021642-0-metal.ppc64le.raw.gz",
+            "sha256": "8d2d4e74841f786aff96b2a2612bd4adb471e4a6fc50603567ebc01b634496e2",
+            "size": 849683091,
+            "uncompressed-sha256": "7f0f610e4508136a44856bd7f0c1bb1ba6542742ec077b14819266f715e7027c",
+            "uncompressed-size": 4019191808
+        },
+        "openstack": {
+            "path": "rhcos-45.81.202004021642-0-openstack.ppc64le.qcow2.gz",
+            "sha256": "2a370cf3c43d6cac0d4df71365e8c2192b7cfde08c36a7309ebaab6fb3f32ec3",
+            "size": 848172336,
+            "uncompressed-sha256": "87fc746008ac25d927d6ec7c284384196e38abedb7fcb28bc26f330d894ef1a9",
+            "uncompressed-size": 2586312704
+        },
+        "ostree": {
+            "path": "rhcos-45.81.202004021642-0-ostree.ppc64le.tar",
+            "sha256": "beb45939e63042e9f576da3d1d52a31fe72272adbded8fdeea6edca228bf4852",
+            "size": 779837440
+        },
+        "qemu": {
+            "path": "rhcos-45.81.202004021642-0-qemu.ppc64le.qcow2.gz",
+            "sha256": "ee2a14367242ed1292fe96dbe985db3f4d98c1d862b36829b7c93eaa7396b2c0",
+            "size": 849206371,
+            "uncompressed-sha256": "c07f8e45cec4726d3598c17ccc55b9b46ae46e32ca6a425150df95dfa022096a",
+            "uncompressed-size": 2632450048
+        }
+    },
+    "oscontainer": {
+        "digest": "sha256:007777f87cfd58d2149165258cab66301e22a60eafd311cea79bf462bc262b3e",
+        "image": "quay.io/openshift-release-dev/ocp-v4.0-art-dev"
+    },
+    "ostree-commit": "67abbb880940e9f4fc2d5b2d4c31a97a569ba61ccf39a09db976eb4a043453e9",
+    "ostree-version": "45.81.202004021642-0"
+}