v0.1.4 — prebuilt Docker image on GHCR (closes #5)

Adds a GitHub Actions workflow that builds and pushes the Docker image
to ghcr.io/rgjorge/containerflow on every tag push, so end users can run
ContainerFlow without cloning the repo or building locally.

- New workflow: .github/workflows/docker-release.yml
- docker-compose.yml: uses the prebuilt image from GHCR by default
- New docker-compose.local.yml: override for building from source (devs)
- .env.example: simplified + adds COMPOSE_FILE toggle for local build
- README EN + ES: quick-start updated to no-clone flow
- .gitignore: ignore task/ planning notes dir

docker-compose.local.yml

@@ -0,0 +1,15 @@
+# Override compose file for local development / building from source.
+# Activated via COMPOSE_FILE env var in .env (see .env.example).
+#
+# Usage:
+#   1. In .env, set: COMPOSE_FILE=docker-compose.yml:docker-compose.local.yml
+#   2. Run: docker compose up -d --build
+#
+# This overrides the `image:` from docker-compose.yml with a local build,
+# tagging it as `containerflow:local` so it's distinguishable from
+# prebuilt versions.
+
+services:
+  containerflow:
+    build: .
+    image: containerflow:local