appsre-ansible: support aarch64

make ansible playbooks arch-agnostic
extract embedded bash script into separate file with parameters
update packer template to support aarch64
Convert parts of bash script to python code that can start multi-arch instances to build RPMS

templates/packer/ansible/inventory/rhel-8-aarch64/group_vars/all.yml

@@ -0,0 +1,5 @@
+---
+# this is just a template!
+# the actual content is generated by build/appsre-build-worker-packer.sh
+rpmrepo_distribution: distro
+osbuild_commit: abcdef

templates/packer/ansible/roles/common/tasks/packages.yml

@@ -96,7 +96,7 @@
     - rpmcopy
   ansible.posix.synchronize:
     mode: push
-    src: "{{ playbook_dir }}/roles/common/files/rpmbuild/RPMS"
+    src: "{{ playbook_dir }}/roles/common/files/rpmbuild/{{ ansible_architecture }}/RPMS"
     dest: /tmp/rpmbuild
 
 - name: Add repo config

templates/packer/worker.pkr.hcl

@@ -55,6 +55,36 @@ build {
     }
   }
 
+  source "amazon-ebs.image_builder" {
+    name = "rhel-8-aarch64"
+
+    # Use a static RHEL 8.6 Cloud Access Image.
+    source_ami = "ami-0c84d76d81209a0e2"
+    ssh_username = "ec2-user"
+    instance_type = "c6g.large"
+
+    # Set a name for the resulting AMI.
+    ami_name = "${var.image_name}"
+
+    # Apply tags to the resulting AMI/EBS snapshot.
+    tags = {
+      AppCode = "IMGB-001"
+      Name = "${var.image_name}"
+      composer_commit = "${var.composer_commit}"
+      os = "rhel"
+      os_version = "8"
+      arch = "aarch64"
+    }
+
+    # Ensure that the EBS snapshot used for the AMI meets our requirements.
+    launch_block_device_mappings {
+      delete_on_termination = "true"
+      device_name           = "/dev/sda1"
+      volume_size           = 10
+      volume_type           = "gp2"
+    }
+  }
+
   source "amazon-ebs.image_builder"  {
     name = "fedora-35-x86_64"