tests: move llb tests into tests/llb

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

tests/llb/copy/invalid/cache/main.cue

@@ -0,0 +1,45 @@
+package testing
+
+test1: {
+	string
+
+	#compute: [
+		{
+			do:  "fetch-container"
+			ref: "busybox"
+		},
+		{
+			do: "copy"
+			from: [{do: "fetch-container", ref: "alpine"}]
+			src:  "/etc/issue"
+			dest: "/"
+		},
+		{
+			do:     "export"
+			source: "/issue"
+			format: "string"
+		},
+	]
+}
+
+test2: {
+	string
+
+	#compute: [
+		{
+			do:  "fetch-container"
+			ref: "busybox"
+		},
+		{
+			do: "copy"
+			from: [{do: "fetch-container", ref: "busybox"}]
+			src:  "/etc/issue"
+			dest: "/"
+		},
+		{
+			do:     "export"
+			source: "/issue"
+			format: "string"
+		},
+	]
+}