docker build broken

[PulsarFX]

I'm submitting a ..

• Bug Report

Current behavior:
running docker-compose -f docker-compose.yml.production-example build --no-cache
results in

Step 6/9 : RUN export NOKOGIRI_USE_SYSTEM_LIBRARIES=1; bundle install --jobs=3 --retry=3 --without test development
 ---> Running in 1b63bad22a26
Following files may not be writable, so sudo is needed:
  /usr/bin
  /usr/lib64/ruby/gems/2.5.0
  /usr/lib64/ruby/gems/2.5.0/build_info
  /usr/lib64/ruby/gems/2.5.0/cache
  /usr/lib64/ruby/gems/2.5.0/doc
  /usr/lib64/ruby/gems/2.5.0/extensions
  /usr/lib64/ruby/gems/2.5.0/gems
  /usr/lib64/ruby/gems/2.5.0/specifications
Your Ruby version is 2.5.8, but your Gemfile specified 2.5.0
ERROR: Service 'production_web' failed to build: The command '/bin/sh -c export NOKOGIRI_USE_SYSTEM_LIBRARIES=1; bundle install --jobs=3 --retry=3 --without test development' returned a non-zero code: 18

I also tried to change to ruby '2.5.8'
which results in:

Installing prawn-rails 1.2.0
Installing devise_ichain_authenticatable 0.3.2
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /tmp/bundler20201106-6-1x2m5fmpg-1.1.4/gems/pg-1.1.4/ext
/usr/bin/ruby.ruby2.5 -r ./siteconf20201106-6-18mpgvm.rb extconf.rb
checking for pg_config... no
No pg_config... trying anyway. If building fails, please try again with
 --with-pg-config=/path/to/pg_config
checking for libpq-fe.h... no
Can't find the 'libpq-fe.h header
*** extconf.rb failed ***

Expected correct behavior:
build succeeds

Steps to reproduce:

git clone https://github.com/openSUSE/osem.git
cd osem
cp dotenv.example .env.production
docker-compose -f docker-compose.yml.production-example build

[AndrewKvalheim]

Your Ruby version is 2.5.8, but your Gemfile specified 2.5.0

This is resolved by #2646 or #2680.

Can't find the 'libpq-fe.h header

This is resolved by #2697.