revert dotenv in Gemfile, leverage vanilla ENV for db switcher

Gemfile

@@ -1,4 +1,3 @@
-require 'dotenv/load'
 source 'https://rubygems.org'
 
 # database, ORM, server
@@ -19,13 +18,13 @@ gem 'puppeteer-ruby', '~> 0.45.6'
 # image processing
 gem 'mini_magick', '~> 4.12.0'
 
-if ENV['BYOS_DATABASE'] == 'sqlite'
+byos_database = ENV.fetch('BYOS_DATABASE', 'pg')
+if byos_database == 'sqlite'
   gem 'sqlite3'
 else
   gem 'pg'
 end
 
-
 group :development, :test do
   gem 'debug'
 end

Gemfile.lock

@@ -62,11 +62,11 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2024.1203)
     mini_magick (4.12.0)
-    mini_portile2 (2.8.8)
     minitest (5.25.4)
     mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.7.4)
+    pg (1.5.9)
     pry (0.15.2)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -107,9 +107,6 @@ GEM
     sinatra-activerecord (2.0.28)
       activerecord (>= 4.1)
       sinatra (>= 1.0)
-    sqlite3 (2.5.0)
-      mini_portile2 (~> 2.8.0)
-    sqlite3 (2.5.0-x86_64-darwin)
     stringio (3.1.2)
     tilt (2.6.0)
     timeout (0.4.2)
@@ -133,13 +130,13 @@ DEPENDENCIES
   forme
   json
   mini_magick (~> 4.12.0)
+  pg
   pry
   puma
   puppeteer-ruby (~> 0.45.6)
   rackup
   rake
   sinatra-activerecord
-  sqlite3
 
 BUNDLED WITH
    2.5.6

dotenv-sample

@@ -1,3 +1,2 @@
 BASE_URL="http://192.168.68.57:4567"
 APP_ENV="production"
-BYOS_DATABASE= # 'sqlite' or 'pg' - leave blank for postgres