Updated the correct dockerfile instead how about

.github/workflows/lint_and_test.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     if: "! contains(toJSON(github.event.commits.*.message), '[skip ci]')"
     env:
-      COMPOSE_FILE: ./docker/docker-compose.ci.yml
+      COMPOSE_FILE: ./docker-compose.ci.yml
 
     steps:
       - name: Checkout code

docker-compose.yml

@@ -1,9 +1,8 @@
-version: '3'
 services:
   phx:
     build:
       context: .
-      dockerfile: ./dev.Dockerfile
+      dockerfile: ./docker/dev.Dockerfile
     volumes:
       - '.:/app'
     ports:

docker/docker-compose.ci.yml

@@ -1,9 +1,8 @@
-version: '3'
 services:
   phx:
     build:
       context: .
-      dockerfile: ./docker/dev.Dockerfile
+      dockerfile: ./dev.Dockerfile
     environment:
       - MIX_ENV=test
     volumes: