1004 test implementation

Signed-off-by: Guillaume de Rouville <guillaume.derouville@gmail.com>

docs/learn/tests/multibucket/netlify.cue

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+package multibucket
+
+import (
+	"alpha.dagger.io/netlify"
+)
+
+// Netlify site
+site: "netlify": netlify.#Site & {
+	contents: app.build
+}

docs/learn/tests/multibucket/source.cue

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+package multibucket
+
+import (
+	"alpha.dagger.io/dagger"
+)
+
+// Source code of the sample application
+src: dagger.#Artifact & dagger.#Input

docs/learn/tests/multibucket/yarn.cue

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+package multibucket
+
+import (
+	"alpha.dagger.io/js/yarn"
+)
+
+// Build the source code using Yarn
+app: yarn.#Package & {
+	source: src
+}