revert specification for Dockerfile

packages/app/docker/Dockerfile.nginx

@@ -1,4 +0,0 @@
-# syntax = docker/dockerfile:1.4
-
-
-FROM nginx:1.23

packages/app/docker/codebuild/buildspec.yml

@@ -18,8 +18,7 @@ phases:
       - echo ${DOCKER_REGISTRY_ON_GITHUB_PAT} | docker login ghcr.io --username wsmoogle --password-stdin
   build:
     commands:
-      # - docker build -t $TAG -f ./packages/app/docker/Dockerfile .
-      - docker build -t ${IMAGE_TAG} -f ./packages/app/docker/Dockerfile.nginx .
+      - docker build -t ${IMAGE_TAG} -f ./packages/app/docker/Dockerfile .
       - docker tag ${IMAGE_TAG} ${IMAGE_TAG_GHCR}
 
   post_build: