Improved the Build subcommand to support the building of Docker images (#11)

This PR contains the work done to support the building of Docker images in the `Build` subcommand in the executable target. So, for this purpose, the following task have been done:

- added a basic boilerplate of the `docker-compose.yml` file;
- fixed some issues found in the boilerplate of the `Dockerfile` file;
- defined the `Randomable` protocol;
- defined the `Artifact` enumeration;
- updated the `BuildProjectTask` task to support building Docker images if required;
- renamed the `BuildProjectTask` task as `BuildArtifactTask`.

Reviewed-on: #11
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Test/Sources/Cases/Internal/Protocols/RandomableTests.swift

@@ -0,0 +1,32 @@
+import Testing
+
+@testable import ColibriLibrary
+
+struct RandomableTest {
+
+    @Test func random() {
+        // GIVEN
+        let allCases = TestRandomable.allCases
+
+        // WHEN
+        let random = TestRandomable.random()
+        
+        // THEN
+        #expect(allCases.contains(random))
+    }
+
+}
+
+// MARK: - Enumerations
+
+enum TestRandomable: Randomable {
+    case someCase
+    case someOtherCase
+
+    // MARK: Functions
+    
+    static func random() -> TestRandomable {
+        .allCases.randomElement() ?? .someCase
+    }
+    
+}