Preserve the multi-platform CLI build cache during validation

.github/workflows/cli-docker-validation.yml

@@ -58,8 +58,11 @@ jobs:
           load: true
           tags: livesync-cli
           platforms: linux/amd64
-          cache-from: type=gha,scope=cli-image
-          cache-to: type=gha,scope=cli-image,mode=max
+          cache-from: |
+            type=gha,scope=cli-image-amd64
+            type=gha,scope=cli-image
+          # Keep amd64 validation from replacing the cache for both platforms.
+          cache-to: type=gha,scope=cli-image-amd64,mode=max
 
       - name: Setup Node.js
         uses: actions/setup-node@v5

.github/workflows/cli-docker.yml

@@ -129,5 +129,7 @@ jobs:
                   push: ${{ steps.meta.outputs.push }}
                   tags: ${{ steps.meta.outputs.tags }}
                   platforms: linux/amd64,linux/arm64
-                  cache-from: type=gha,scope=cli-image
+                  cache-from: |
+                      type=gha,scope=cli-image-amd64
+                      type=gha,scope=cli-image
                   cache-to: type=gha,scope=cli-image,mode=max

utils/cli-ci.unit.spec.ts

@@ -138,6 +138,12 @@ describe("CLI CI selection", () => {
             step.uses?.startsWith("docker/build-push-action@")
         );
         expect(publishBuild?.with?.["cache-from"]).toBe(build?.with?.["cache-from"]);
-        expect(publishBuild?.with?.["cache-to"]).toBe(build?.with?.["cache-to"]);
+        const validationScope = String(build?.with?.["cache-to"]).match(/scope=([^,\s]+)/)?.[1];
+        const publicationScope = String(publishBuild?.with?.["cache-to"]).match(/scope=([^,\s]+)/)?.[1];
+        expect(validationScope).toBeDefined();
+        expect(publicationScope).toBeDefined();
+        expect(publicationScope).not.toBe(validationScope);
+        expect(publishBuild?.with?.["cache-from"]).toContain(`scope=${validationScope}`);
+        expect(publishBuild?.with?.["cache-from"]).toContain(`scope=${publicationScope}`);
     });
 });