fix(pipeline): buildspec works with Dockerfiles in subdirs (#902)

Fixes #893

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

templates/cicd/buildspec.yml

@@ -54,9 +54,10 @@ phases:
       #     - Login and push the image.
       - >
         for app in $apps; do
-          for docker_dir in $(cat $CODEBUILD_SRC_DIR/ecs-project/$app/manifest.yml | ruby -ryaml -rjson -e 'puts JSON.pretty_generate(YAML.load(ARGF))' | jq '.image.build' | sed 's/"//g'); do
-          cd $CODEBUILD_SRC_DIR/$docker_dir;
-          docker build -t $app:$tag .;
+          for df_rel_path in $(cat $CODEBUILD_SRC_DIR/ecs-project/$app/manifest.yml | ruby -ryaml -rjson -e 'puts JSON.pretty_generate(YAML.load(ARGF))' | jq '.image.build' | sed 's/"//g'); do
+          df_path=$CODEBUILD_SRC_DIR/$df_rel_path
+          df_dir_path=$(dirname "$df_path")
+          docker build -t $app:$tag -f $df_path $df_dir_path;
           image_id=$(docker images -q $app:$tag);
             for env in $envs; do
             repo=$(cat $CODEBUILD_SRC_DIR/infrastructure/$app-$env.params.json | jq '.Parameters.ContainerImage' | sed 's/"//g');