tests: migrate ops test to bats

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

tests/ops/export/invalid/path/main.cue

@@ -0,0 +1,18 @@
+package testing
+
+teststring: {
+	string
+
+	#up: [
+		{
+			do:  "fetch-container"
+			ref: "alpine"
+		},
+		{
+			do: "export"
+			// Source path in the container
+			source: "/tmp/lalala"
+			format: "string"
+		},
+	]
+}