Prevent failure with duplicate flags in EXTRA_OPTS

[dsimog01]

When someone installs a new version of a package in which they have included EXTRA_OPTS, if this new version comes with any of the flags defined in EXTRA_OPTS there is a duplication that causes the package to stop working.

This is the solution we have thought of in the package side (for each package that includes EXTRA_OPTS):

1. The docker-compose must include these envs: 1.1. FLAGS => Will include the default flags for that package 1.2. EXTRA_OPTS => Will be empty by default and edited by the user if desired in the package config section

2. The command execution format in the entrypoint.sh will be the following: ./command check_extra_opts(FLAGS, EXTRA_OPTS)

3. The package will include the file check_extra_opts.sh that needs to be copied to the image in build time and it wll be called as defined above in the entrypoint.sh

4. This check_extra_opts.sh file will return a "space separated" string removing the flags presents both in EXTRA_OPTSand FLAGS from FLAGS, giving priority to those introduced by the user (EXTRA_OPTS)

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