ci: Rework

Signed-off-by: Colin Walters <walters@verbum.org>

.gitlab-ci.yml

@@ -1,15 +1,17 @@
----
-include:
-  - remote: https://gitlab.com/platform-engineering-org/gitlab-ci/-/raw/main/templates/build-image.gitlab-ci.yml
+stages:
+  - build
 
-build-image:
+variables:
+  IMAGE_PREFIX: ${CI_REGISTRY}/${CI_PROJECT_PATH}
+
+.build-image:
+  stage: build
+  image: quay.io/buildah/stable:v1.38.0
+  needs: []
+
+build:
   extends: .build-image
-  parallel:
-    matrix:
-      - TIER: [tier-0, tier-1, tier-x]
-  variables:
-    EXTRA_ARGS: "--security-opt=label=disable --cap-add=all --build-arg MANIFEST=fedora-$TIER.yaml"
-  rules:
-    - if: $CI_PROJECT_NAMESPACE != "fedora/bootc"
-      when: never
-    - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+  stage: build
+  script: |
+    buildah bud -f Containerfile.base --no-cache --security-opt=label=disable --cap-add=all --device /dev/fuse -t ${IMAGE_PREFIX}-base .
+    buildah bud -f Containerfile --no-cache --from ${IMAGE_PREFIX}-base -t ${IMAGE_PREFIX}-standard .