Significantly reduced image size

Author: ankane

Dockerfile

@@ -1,27 +1,25 @@
-FROM ruby:2.7.5-alpine3.13
+FROM ruby:3.0.4-alpine3.15
 
 MAINTAINER Andrew Kane <andrew@ankane.org>
 
-RUN apk add --update ruby-dev build-base \
-  libxml2-dev libxslt-dev pcre-dev libffi-dev \
-  postgresql-dev mysql-dev sqlite-dev git \
-  unixodbc-dev freetds-dev
-
-RUN gem install bundler
-
-ENV INSTALL_PATH /app
+ARG INSTALL_PATH=/app
+ARG RAILS_ENV=production
+ARG DATABASE_URL=postgresql://user:pass@127.0.0.1/dbname
+ARG SECRET_TOKEN=dummytoken
 
 RUN mkdir -p $INSTALL_PATH
 
 WORKDIR $INSTALL_PATH
 
-COPY Gemfile Gemfile.lock ./
-
-RUN bundle install --binstubs
-
 COPY . .
 
-RUN bundle exec rake RAILS_ENV=production DATABASE_URL=postgresql://user:pass@127.0.0.1/dbname SECRET_TOKEN=dummytoken assets:precompile
+RUN apk add --update ruby-dev build-base libxml2-dev libxslt-dev pcre-dev libffi-dev libpq-dev mariadb-dev sqlite-dev git unixodbc-dev libpq mariadb-connector-c sqlite-libs unixodbc && \
+    gem install bundler && \
+    bundle install && \
+    bundle exec rails app:update:bin && \
+    bundle exec rake assets:precompile && \
+    apk del ruby-dev build-base libxml2-dev libxslt-dev pcre-dev libffi-dev libpq-dev mariadb-dev sqlite-dev git unixodbc-dev unixodbc-dev && \
+    rm -rf /var/cache/apk/*
 
 ENV PORT 8080