create a new method for inferring the PPID

Dockerfile

@@ -9,8 +9,6 @@ RUN <<EOT
   apk upgrade --no-cache
 EOT
 
-RUN mkdir -p /run/app
-
 
 FROM base AS build
 
@@ -40,10 +38,6 @@ FROM base
 # RUN useradd ruby --home /app --shell /bin/sh
 RUN adduser ruby -h /app -D
 
-RUN mkdir -p /run/app
-
-RUN chown ruby:ruby /run/app
-
 USER ruby:ruby
 
 COPY --from=build /usr/local/bundle /usr/local/bundle