Why does docker build not use the build cache? -

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Every time I change my Dockerfile , the Docker runs all of my orders again , Even if I have some commands not cached at the end of the change file.

Image in my special image was based on this statement 

  Add ONBUILD This means that no statement can be cached in my  Dockerfile  when my  Dockerfile  changes, because  add / some / path  executes any statement before it is executed.  
 In general: If any change in  ADD  Dockerfile  invalidates the cache.      P>  My Solution  was inserting files that I would like to specify on a subdirectory  my_data  And then want to add the contents of the subdirectory to the path:  
  add my_data / some / path   
 Unfortunately,  Dockerfile < By adding  to / code>. dockerignore  does not help, because then  Docker build  can not be executed because it does not search for  Dockerfile  and you get an error  Dockerfile DocAgnor Pattern was excluded by 'DockerFile'

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