Define and use a safe, reliable test image

The ubi8 image changed some architecture string yesterday and
broke all our CI on all branches, including podman because
it too runs bud.bats tests.

Solution: use a safe, reliable, trustworthy test image (the
one built and used for podman). Because that image does not
have the same labels, confirm pull using .Architecture
instead.

We should stop using ubi8 and registry.redhat (containers#4318). They
are unreliable. This PR doesn't fix that; it's just an
emergency patch for one specific CI break. We can use
this as a basis for future removals of ubi8.

Signed-off-by: Ed Santiago <santiago@redhat.com>

tests/bud.bats

@@ -3981,24 +3981,24 @@ _EOF
   mytmpdir=${TEST_SCRATCH_DIR}/my-dir
   mkdir -p ${mytmpdir}
 cat > $mytmpdir/Containerfile << _EOF
-FROM registry.access.redhat.com/ubi8-minimal
+FROM $SAFEIMAGE
 _EOF
-  run_buildah build -f Containerfile --pull=false -q --arch=amd64 -t image-amd $WITH_POLICY_JSON ${mytmpdir}
-  run_buildah inspect --format '{{ index .Docker.Config.Labels "architecture" }}' image-amd
-  expect_output --substring x86_64
+  run_buildah build --pull=false -q --arch=amd64 -t image-amd $WITH_POLICY_JSON ${mytmpdir}
+  run_buildah inspect --format '{{ .OCIv1.Architecture }}' image-amd
+  expect_output amd64
 
-  # Tag the image to localhost/ubi8-minimal to make sure that the image gets
+  # Tag the image to localhost/safeimage to make sure that the image gets
   # pulled since the local one does not match the requested architecture.
-  run_buildah tag image-amd localhost/ubi8-minimal
-  run_buildah build -f Containerfile --pull=false -q --arch=arm64 -t image-arm $WITH_POLICY_JSON ${mytmpdir}
-  run_buildah inspect --format '{{ index .Docker.Config.Labels "architecture" }}' image-arm
-  expect_output --substring arm64
+  run_buildah tag image-amd localhost/${SAFEIMAGE_NAME}:${SAFEIMAGE_TAG}
+  run_buildah build --pull=false -q --arch=arm64 -t image-arm $WITH_POLICY_JSON ${mytmpdir}
+  run_buildah inspect --format '{{ .OCIv1.Architecture }}' image-arm
+  expect_output arm64
 
   run_buildah inspect --format '{{ .FromImageID }}' image-arm
   fromiid=$output
 
-  run_buildah inspect --format '{{ index .OCIv1.Architecture  }}'  $fromiid
-  expect_output --substring arm64
+  run_buildah inspect --format '{{ .OCIv1.Architecture  }}'  $fromiid
+  expect_output arm64
 }
 
 @test "bud --file with directory" {

tests/helpers.bash

@@ -13,6 +13,13 @@ OCI=$(${BUILDAH_BINARY} info --format '{{.host.OCIRuntime}}' || command -v runc
 # Default timeout for a buildah command.
 BUILDAH_TIMEOUT=${BUILDAH_TIMEOUT:-300}
 
+# Safe reliable unchanging test image
+SAFEIMAGE_REGISTRY=${SAFEIMAGE_REGISTRY:-quay.io}
+SAFEIMAGE_USER=${SAFEIMAGE_USER:-libpod}
+SAFEIMAGE_NAME=${SAFEIMAGE_NAME:-testimage}
+SAFEIMAGE_TAG=${SAFEIMAGE_TAG:-20221018}
+SAFEIMAGE="${SAFEIMAGE:-$SAFEIMAGE_REGISTRY/$SAFEIMAGE_USER/$SAFEIMAGE_NAME:$SAFEIMAGE_TAG}"
+
 # Shortcut for directory containing Containerfiles for bud.bats
 BUDFILES=${TEST_SOURCES}/bud