plugin docker: Fix arch string used for container metadata to be comp…

…liant with the standard

Fixes: RHBZ#1793927

imagefactory_plugins/Docker/Docker.py

@@ -40,6 +40,15 @@ class Docker(object):
                           "gzip":  "gzip -c %s > %s",
                           "bzip2": "bzip2 -c %s > %s" }
 
+    # In image metadata, Go arch is used to identify the architecture
+    # https://docs.docker.com/registry/spec/manifest-v2-2/
+    goarchs = { "x86_64": "amd64",
+                "aarch64": "arm64",
+                "armv7hl": "armhfp",
+                "riscv64": "riscv64",
+                "ppc64le": "ppc64le",
+                "s390x": "s390x"}
+
     # The templates below allow us to generate base images without a running docker locally
 
     # imcleod@redhat.com - 26-Aug-2014
@@ -385,7 +394,7 @@ def _run_guestmount(g):
             if set_arch_label:
                 if label == 'null':
                     label = dict()
-                label["architecture"] = tdlobj.arch
+                label["architecture"] = self.goarchs[tdlobj.arch]
 
             rdict = { repository: { tag: docker_image_id } }
 
@@ -394,16 +403,11 @@ def _run_guestmount(g):
                 raise Exception("No docker JSON template available for specified docker version (%s)" % (dockerversion))
             docker_json_template=self.docker_templates_dict[dockerversion]
 
-            arch = tdlobj.arch
-            if arch == "x86_64":
-                arch = "amd64"
-            elif arch == "armv7hl":
-                arch = "armhfp"
             tdict = { }
             tdict['commentstring'] = parameters.get('comment', 'Created by Image Factory')
             tdict['os'] = parameters.get('os', 'linux')
             tdict['createdtime'] = datetime.datetime.utcnow().strftime('%Y-%m-%dT%H:%M:%SZ')
-            tdict['arch'] = arch
+            tdict['arch'] = self.goarchs[tdlobj.arch]
             tdict['idstring'] = docker_image_id
             tdict['cmd'] = cmd
             tdict['env'] = env