europa: Code Embedding POC

WIP PoC for code embedding

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

tests/tasks/source/source_include_exclude.cue

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"dagger.io/dagger/engine"
+)
+
+engine.#Plan & {
+	actions: {
+		image: engine.#Pull & {
+			source: "alpine:3.15.0@sha256:e7d88de73db3d3fd9b2d63aa7f447a10fd0220b7cbf39803c803f2af9ba256b3"
+		}
+
+		sourceInclude: engine.#Source & {
+			path: "."
+			include: ["hello.txt"]
+		}
+
+		sourceExclude: engine.#Source & {
+			path: "."
+			exclude: ["hello.txt"]
+		}
+
+		test: engine.#Exec & {
+			input: image.output
+			mounts: {
+				include: {
+					dest:     "/include"
+					contents: sourceInclude.output
+				}
+				exclude: {
+					dest:     "/exclude"
+					contents: sourceExclude.output
+				}
+			}
+
+			args: ["sh", "-c",
+				#"""
+					test "$(find /include/ | wc -l)" -eq 1
+					test -f /include/hello.txt
+					test ! -f /exclude/hello.txt
+					"""#,
+			]
+		}
+	}
+}