Add a matrixed multi-arch pipeline

Signed-off-by: arewm <[email protected]>

pipelines/docker-build-multi-arch-oci-ta/kustomization.yaml

@@ -0,0 +1,9 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- ../docker-build-oci-ta
+
+patches:
+- path: patch.yaml
+  target:
+    kind: Pipeline

pipelines/docker-build-multi-arch-oci-ta/patch.yaml

@@ -0,0 +1,73 @@
+---
+- op: replace
+  path: /metadata/name
+  value: docker-build-multi-arch-oci-ta
+# Order of Tasks from the base docker-build Pipeline:
+# $ kustomize build pipelines/docker-build-oci-ta | yq ".spec.tasks.[].name" | nl -v 0
+#      0  init
+#      1  clone-repository
+#      2  prefetch-dependencies
+#      3  build-container
+#      4  build-image-index
+#      5  build-source-image
+#      6  deprecated-base-image-check
+#      7  clair-scan
+#      8  ecosystem-cert-preflight-checks
+#      9  sast-snyk-check
+#     10  clamav-scan
+#     11  sbom-json-check
+#     12  apply-tags
+#     13  push-dockerfile
+# change name to build-containers
+# add build-platforms parameter
+# add matrix to run based on build-platforms
+# change build-image-index to use results from build-containers as well as run after it
+# change build-image-index to build image index
+# change JAVA_COMMUNITY_DEPENDENCIES value to "$(tasks.build-containers.results.JAVA_COMMUNITY_DEPENDENCIES[0])"
+
+# build-container
+- op: replace
+  path: /spec/tasks/3/name
+  value: build-containers
+- op: replace
+  path: /spec/tasks/3/taskRef/name
+  value: buildah-remote-oci-ta
+- op: add
+  path: /spec/tasks/3/matrix
+  value:
+    params:
+      - name: PLATFORM
+        value: ["$(params.build-platforms)"]
+
+# build-image-index
+- op: replace
+  path: /spec/tasks/4/params
+  value:
+    - name: IMAGE
+      value: $(params.output-image)
+    - name: COMMIT_SHA
+      value: $(tasks.clone-repository.results.commit)
+    - name: BUILD_IMAGE_INDEX
+      value: "true"
+    - name: IMAGES
+      value:
+      - $(tasks.build-containers.results.IMAGE_REF[*])
+- op: replace
+  path: /spec/tasks/4/runAfter
+  value:
+  - build-containers
+
+# Add a pipeline definition parameter to customize the build platforms
+- op: add
+  path: /spec/params/-
+  value:
+    name: build-platforms
+    description: List of platforms to build the container images on. The available set of values is determined by the configuration of the multi-platform-controller.
+    type: array
+    default:
+      - "local/amd64"
+
+# Just use the first container built for the JAVA_COMMUNITY_DEPENDENCIES result
+- op: replace 
+  path: /spec/results/4/value
+  value: $(tasks.build-containers.results.JAVA_COMMUNITY_DEPENDENCIES[0])