sad

sudo docker-compose build
db uses an image, skipping
Building web
Step 1/13 : FROM ruby:2.6-alpine
 ---> 6ddb199f039f
Step 2/13 : RUN apk update -qq && apk add nodejs postgresql-client gcc make ruby-dev
 ---> Running in fc796ed75f6a
(1/21) Installing binutils (2.32-r0)
(2/21) Installing isl (0.18-r0)
(3/21) Installing libgomp (8.3.0-r0)
(4/21) Installing libatomic (8.3.0-r0)
(5/21) Installing mpfr3 (3.1.5-r1)
(6/21) Installing mpc1 (1.1.0-r0)
(7/21) Installing gcc (8.3.0-r0)
(8/21) Installing make (4.2.1-r2)
(9/21) Installing c-ares (1.15.0-r0)
(10/21) Installing http-parser (2.9.2-r0)
(11/21) Installing libuv (1.29.1-r0)
(12/21) Installing nodejs (10.16.3-r0)
(13/21) Installing libedit (20190324.3.1-r0)
(14/21) Installing db (5.3.28-r1)
(15/21) Installing libsasl (2.1.27-r3)
(16/21) Installing libldap (2.4.48-r0)
(17/21) Installing libpq (11.5-r0)
(18/21) Installing postgresql-client (11.5-r0)
(19/21) Installing ruby-libs (2.5.5-r0)
(20/21) Installing ruby (2.5.5-r0)
(21/21) Installing ruby-dev (2.5.5-r0)
Executing busybox-1.30.1-r2.trigger
OK: 153 MiB in 58 packages
Removing intermediate container fc796ed75f6a
 ---> 5c4ad9426965
Step 3/13 : RUN mkdir /myapp
 ---> Running in 06f36502ee22
Removing intermediate container 06f36502ee22
 ---> 158f311c7c0c
Step 4/13 : WORKDIR /myapp
 ---> Running in 3ba9df1e72f4
Removing intermediate container 3ba9df1e72f4
 ---> afccb074cbd1
Step 5/13 : COPY Gemfile /myapp/Gemfile
 ---> 5504e59b3541
Step 6/13 : COPY Gemfile.lock /myapp/Gemfile.lock
 ---> fb68654c8aa8
Step 7/13 : RUN bundle install
 ---> Running in 724606e54f28
The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
Fetching gem metadata from https://rubygems.org/............
Fetching rake 12.3.3
Installing rake 12.3.3
Fetching concurrent-ruby 1.1.5
Installing concurrent-ruby 1.1.5
Fetching i18n 1.6.0
Installing i18n 1.6.0
Fetching minitest 5.11.3
Installing minitest 5.11.3
Fetching thread_safe 0.3.6
Installing thread_safe 0.3.6
Fetching tzinfo 1.2.5
Installing tzinfo 1.2.5
Fetching zeitwerk 2.1.9
Installing zeitwerk 2.1.9
Fetching activesupport 6.0.0.rc1
Installing activesupport 6.0.0.rc1
Fetching builder 3.2.3
Installing builder 3.2.3
Fetching erubi 1.8.0
Installing erubi 1.8.0
Fetching mini_portile2 2.4.0
Installing mini_portile2 2.4.0
Fetching nokogiri 1.10.4
Installing nokogiri 1.10.4 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /usr/local/bundle/gems/nokogiri-1.10.4/ext/nokogiri
/usr/local/bin/ruby -I /usr/local/lib/ruby/2.6.0 -r
./siteconf20190829-1-y8oihv.rb extconf.rb
checking if the C compiler accepts ... *** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=/usr/local/bin/$(RUBY_BASE_NAME)
        --help
        --clean
/usr/local/lib/ruby/2.6.0/mkmf.rb:467:in `try_do': The compiler failed to
generate an executable file. (RuntimeError)
You have to install development tools first.
        from /usr/local/lib/ruby/2.6.0/mkmf.rb:585:in `block in try_compile'
        from /usr/local/lib/ruby/2.6.0/mkmf.rb:532:in `with_werror'
        from /usr/local/lib/ruby/2.6.0/mkmf.rb:585:in `try_compile'
        from extconf.rb:138:in `nokogiri_try_compile'
        from extconf.rb:162:in `block in add_cflags'
        from /usr/local/lib/ruby/2.6.0/mkmf.rb:643:in `with_cflags'
        from extconf.rb:161:in `add_cflags'
        from extconf.rb:416:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can
be found here:

  /usr/local/bundle/extensions/x86_64-linux/2.6.0/nokogiri-1.10.4/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /usr/local/bundle/gems/nokogiri-1.10.4 for
inspection.
Results logged to
/usr/local/bundle/extensions/x86_64-linux/2.6.0/nokogiri-1.10.4/gem_make.out

An error occurred while installing nokogiri (1.10.4), and Bundler cannot
continue.
Make sure that `gem install nokogiri -v '1.10.4' --source
'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  rails was resolved to 6.0.0.rc1, which depends on
    actioncable was resolved to 6.0.0.rc1, which depends on
      actionpack was resolved to 6.0.0.rc1, which depends on
        actionview was resolved to 6.0.0.rc1, which depends on
          rails-dom-testing was resolved to 2.0.3, which depends on
            nokogiri
ERROR: Service 'web' failed to build: The command '/bin/sh -c bundle install' returned a non-zero code: 5