remove old pipelines, run sanity in pipelines because we're dropping zuul

Signed-off-by: Adam Miller <admiller@redhat.com>

tests/utils/shippable/sanity.sh

@@ -1,7 +1,21 @@
 #!/usr/bin/env bash
 
+# Following logic in https://github.com/ansible-collections/collection_template/blob/main/.github/workflows/ansible-test.yml
 set -o pipefail -eux
 
+if [ "${BASE_BRANCH:-}" ]; then
+    base_branch="origin/${BASE_BRANCH}"
+else
+    base_branch=""
+fi
+
+# Run sanity tests inside a Docker container.
+# The docker container has all the pinned dependencies that are
+# required and all Python versions Ansible supports.
+
+# See the documentation for the following GitHub action on
+# https://github.com/ansible-community/ansible-test-gh-action/blob/main/README.md
+
 # shellcheck disable=SC2086
 ansible-test sanity --color -v --junit ${COVERAGE:+"$COVERAGE"} ${CHANGED:+"$CHANGED"} \
-    --docker
+    --docker --base-branch "${base_branch}" --allow-disabled