As suggested by yvanzo, use hadolint on the AB Dockerfile

/dev/stdin:12 DL3008 Pin versions in apt get install. Instead of `apt-get install <package>` use `apt-get install <package>=<version>`
/dev/stdin:12 DL4001 Either use Wget or Curl but not both
/dev/stdin:12 DL4006 Set the SHELL option -o pipefail before RUN with a pipe in it. If you are using /bin/sh in an alpine image or if your shell is symlinked to busybox then consider explicitly setting your SHELL to /bin/ash, or disable this check
/dev/stdin:48 DL3003 Use WORKDIR to switch to a directory
/dev/stdin:58 DL3003 Use WORKDIR to switch to a directory
/dev/stdin:69 DL3003 Use WORKDIR to switch to a directory
/dev/stdin:69 DL4001 Either use Wget or Curl but not both
/dev/stdin:129 DL3020 Use COPY instead of ADD for files and folders