Docker container version (#39)

* + Dockerfile and compose file
+ Scripts dir and startup script
+ Build image npm script

* * Moves env to file

* + Tags image with info from package.json
* Moves image creation to script
* Updates README

* Update README.md

Co-authored-by: Sebastien Castiel <sebastien@castiel.me>

---------

Co-authored-by: Maxime Jacob <mjacob-no-reply@proton.me>
Co-authored-by: Sebastien Castiel <sebastien@castiel.me>

compose.yaml

@@ -0,0 +1,24 @@
+services:
+  app:
+    image: spliit2:latest
+    ports:
+      - 3000:3000
+    env_file:
+      - container.env
+    depends_on:
+      db:
+        condition: service_healthy
+  
+  db:
+    image: postgres:latest
+    ports:
+      - 5432:5432
+    env_file:
+      - container.env
+    volumes:
+      - /var/lib/postgresql/data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres"]
+      interval: 5s
+      timeout: 5s
+      retries: 5