ci(pipeline): update container image build context

- Changes the container image build context from the root to the `src` directory.
- This adjustment improves organization and build efficiency by ensuring the context is limited to relevant files.

Author: winromulus

.github/workflows/pipeline.yaml

@@ -25,7 +25,7 @@ concurrency:
 
 env:
   container_image: "github-actions-runner"
-  container_image_build_context: "."
+  container_image_build_context: "src"
   container_image_build_platforms: "linux/amd64,linux/arm64"
   container_image_build_dockerfile: "src/Dockerfile"
   container_image_repository_dockerhub: "emberstack"