Add arm64 based functional test

An initial functional test for bionic/arm64 builds, put it in the new
arm64 check queue.

Change-Id: I5f8a047f41c6555da7211b758c55f7a87b3aa5d1

.zuul.d/jobs.yaml

@@ -75,6 +75,16 @@
         - ubuntu-systemd-container/bionic-build-succeeds
         - ubuntu-systemd-container/xenial-build-succeeds
 
+- job:
+    name: dib-functests-arm64
+    description: |
+      ARM64 build tests
+    abstract: true
+    parent: dib-functests-base
+    vars:
+      dib_functests:
+        - ubuntu-minimal/bionic-arm64-build-succeeds
+
 # Trusty / Python 2 tests
 - job:
     name: dib-functests-trusty-python2
@@ -199,8 +209,15 @@
     vars:
       dib_python: python2
 
-# Build and boot functional tests
+# ARM64 tests
+- job:
+    name: dib-functests-arm64-bionic
+    description: |
+      ARM64 image tests building on am ARM64 Bionic host
+    nodeset: ubuntu-bionic-arm64
+    parent: dib-functests-arm64
 
+# Build and boot functional tests
 - job:
     name: dib-nodepool-functional-src-base
     description: |

.zuul.d/project.yaml

@@ -32,6 +32,9 @@
         - dib-functests-bionic-python3-image
         - dib-functests-bionic-python3-extras
         - dib-functests-bionic-python3-containers
+    check-arm64:
+      jobs:
+        - dib-functests-arm64-bionic
     gate:
       jobs:
         - openstack-tox-pylint

diskimage_builder/elements/openstack-ci-mirrors/environment.d/11-dib-distribution-mirror.bash

@@ -21,7 +21,11 @@ $_xtrace
 # note 11- is after 10- which is where DISTRO_NAME is set usually
 
 if [[ "${DISTRO_NAME}" == "ubuntu" ]]; then
-    export DIB_DISTRIBUTION_MIRROR=$NODEPOOL_UBUNTU_MIRROR
+    if [[ "${ARCH}" == "arm64" ]]; then
+        export DIB_DISTRIBUTION_MIRROR=${NODEPOOL_UBUNTU_PORTS_MIRROR}
+    elif [[ "${ARCH}" == "amd64" ]]; then
+        export DIB_DISTRIBUTION_MIRROR=$NODEPOOL_UBUNTU_MIRROR
+    fi
     export DIB_DEBOOTSTRAP_EXTRA_ARGS+=" --no-check-gpg"
 elif [[ "${DISTRO_NAME}" == "debian" ]]; then
     export DIB_DISTRIBUTION_MIRROR=$NODEPOOL_DEBIAN_MIRROR

diskimage_builder/elements/ubuntu-minimal/test-elements/bionic-arm64-build-succeeds/README.rst

@@ -0,0 +1,4 @@
+Verify we can build a ubuntu-minimal image.
+
+Note this test includes the vm element to test the bootloader install,
+and specifies to output a .qcow2

diskimage_builder/elements/ubuntu-minimal/test-elements/bionic-arm64-build-succeeds/element-deps

@@ -0,0 +1,3 @@
+block-device-efi
+openstack-ci-mirrors
+vm

diskimage_builder/elements/ubuntu-minimal/test-elements/bionic-arm64-build-succeeds/environment.d/10-set-distro.bash

@@ -0,0 +1 @@
+export DIB_RELEASE=bionic

diskimage_builder/elements/ubuntu-minimal/test-elements/bionic-arm64-build-succeeds/test-output-formats

@@ -0,0 +1 @@
+tar,qcow2