Adding first .drone.yml draft with simple composer build and console run.

.drone.yml

@@ -0,0 +1,16 @@
+kind: pipeline
+type: docker
+name: build-app
+
+steps:
+  - name: build-deps
+    image: 'composer:2.3'
+    environment:
+      APP_ENV: dev
+    commands:
+      - composer install --no-progress --no-interaction --optimize-autoloader
+      - bin/console about
+      - 'bin/console lint:container'
+      - 'bin/console lint:twig'
+      - 'bin/console lint:container'
+      - 'bin/console lint:yaml'