test: implemented cli tests for input git,dir

Signed-off-by: Sam Alba <sam.alba@gmail.com>

tests/cli/input/main.cue

@@ -0,0 +1,25 @@
+package testing
+
+import (
+	"dagger.io/llb"
+	"dagger.io/dagger"
+)
+
+source: dagger.#Artifact
+foo: "bar"
+
+bar: {
+	string
+
+	#compute: [
+		llb.#FetchContainer & {ref: "busybox"},
+		llb.#Exec & {
+			args: ["cp", "/source/testfile", "/out"],
+			mount: "/source": from: source
+		},
+		llb.#Export & {
+			format: "string"
+			source: "/out"
+		}
+	]
+}

tests/cli/input/testdata/testfile

@@ -0,0 +1 @@
+thisisatest