Work on integration tests

- add new entries for #70 and #74
- cleaned-up / enriched a little bit compute and exec tests

Signed-off-by: dubo-dubon-duponey <dubodubonduponey+github@pm.me>

examples/tests/compute/success/noop/main.cue

@@ -0,0 +1,11 @@
+package testing
+
+// no-op, should not error
+realempty: {
+	#dagger: {}
+}
+
+// no-op, should not error
+empty: {
+	#dagger: compute: []
+}