feat: Add platform arg to force building a specific architecture

integration-tests/test-repo/recipes/recipe-arm64.yml

@@ -0,0 +1,38 @@
+name: cli/test
+description: This is my personal OS image.
+base-image: quay.io/fedora/fedora-silverblue
+image-version: 40
+alt_tags:
+  - arm64
+stages:
+modules:
+  - from-file: akmods.yml
+  - from-file: flatpaks.yml
+
+  - type: files
+    files:
+      - usr: /usr
+
+  - type: script
+    scripts:
+      - example.sh
+
+  - type: rpm-ostree
+    repos:
+      - https://copr.fedorainfracloud.org/coprs/atim/starship/repo/fedora-%OS_VERSION%/atim-starship-fedora-%OS_VERSION%.repo
+    install:
+      - micro
+      - starship
+    remove:
+      - firefox
+      - firefox-langpacks
+
+  - type: signing
+
+  - type: test-module
+
+  - type: containerfile
+    containerfiles:
+      - labels
+    snippets:
+      - RUN echo "This is a snippet" && ostree container commit