Track Gemfile.lock

References why Gemfile.lock should be in the version control also for Rubygems:
* @josevalim heartcombo/devise#3147 (comment)
* @rafaelfranca rails/rails#18951 (comment)

Also Rails has Gemfile.lock in git:
* rails/rails@0ad6d27

Gemfile.lock

@@ -0,0 +1,169 @@
+PATH
+  remote: .
+  specs:
+    sap-jwt-utils (0.1.0)
+      faraday
+      jwt
+      multi_json
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    ast (2.4.2)
+    backport (1.2.0)
+    benchmark (0.1.1)
+    byebug (11.1.3)
+    coderay (1.1.3)
+    diff-lcs (1.4.4)
+    e2mmap (0.1.0)
+    faraday (1.5.1)
+      faraday-em_http (~> 1.0)
+      faraday-em_synchrony (~> 1.0)
+      faraday-excon (~> 1.1)
+      faraday-httpclient (~> 1.0.1)
+      faraday-net_http (~> 1.0)
+      faraday-net_http_persistent (~> 1.1)
+      faraday-patron (~> 1.0)
+      multipart-post (>= 1.2, < 3)
+      ruby2_keywords (>= 0.0.4)
+    faraday-em_http (1.0.0)
+    faraday-em_synchrony (1.0.0)
+    faraday-excon (1.1.0)
+    faraday-httpclient (1.0.1)
+    faraday-net_http (1.0.1)
+    faraday-net_http_persistent (1.2.0)
+    faraday-patron (1.0.0)
+    ffi (1.15.3)
+    formatador (0.3.0)
+    guard (2.18.0)
+      formatador (>= 0.2.4)
+      listen (>= 2.7, < 4.0)
+      lumberjack (>= 1.0.12, < 2.0)
+      nenv (~> 0.1)
+      notiffany (~> 0.0)
+      pry (>= 0.13.0)
+      shellany (~> 0.0)
+      thor (>= 0.18.1)
+    guard-compat (1.2.1)
+    guard-rspec (4.7.3)
+      guard (~> 2.1)
+      guard-compat (~> 1.1)
+      rspec (>= 2.99.0, < 4.0)
+    jaro_winkler (1.5.4)
+    jwt (2.2.3)
+    kramdown (2.3.1)
+      rexml
+    kramdown-parser-gfm (1.1.0)
+      kramdown (~> 2.0)
+    listen (3.6.0)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
+    lumberjack (1.2.8)
+    method_source (1.0.0)
+    mini_portile2 (2.5.3)
+    multi_json (1.15.0)
+    multipart-post (2.1.1)
+    nenv (0.3.0)
+    nokogiri (1.11.7)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
+    notiffany (0.1.3)
+      nenv (~> 0.1)
+      shellany (~> 0.0)
+    parallel (1.20.1)
+    parser (3.0.2.0)
+      ast (~> 2.4.1)
+    pry (0.14.1)
+      coderay (~> 1.1)
+      method_source (~> 1.0)
+    racc (1.5.2)
+    rainbow (3.0.0)
+    rake (13.0.6)
+    rb-fsevent (0.11.0)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    regexp_parser (2.1.1)
+    reverse_markdown (2.0.0)
+      nokogiri
+    rexml (3.2.5)
+    rspec (3.10.0)
+      rspec-core (~> 3.10.0)
+      rspec-expectations (~> 3.10.0)
+      rspec-mocks (~> 3.10.0)
+    rspec-core (3.10.1)
+      rspec-support (~> 3.10.0)
+    rspec-expectations (3.10.1)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-mocks (3.10.2)
+      diff-lcs (>= 1.2.0, < 2.0)
+      rspec-support (~> 3.10.0)
+    rspec-support (3.10.2)
+    rubocop (1.18.4)
+      parallel (~> 1.10)
+      parser (>= 3.0.0.0)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml
+      rubocop-ast (>= 1.8.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.8.0)
+      parser (>= 3.0.1.1)
+    rubocop-rspec (2.4.0)
+      rubocop (~> 1.0)
+      rubocop-ast (>= 1.1.0)
+    ruby-progressbar (1.11.0)
+    ruby2_keywords (0.0.5)
+    shellany (0.0.1)
+    solargraph (0.43.0)
+      backport (~> 1.2)
+      benchmark
+      bundler (>= 1.17.2)
+      diff-lcs (~> 1.4)
+      e2mmap
+      jaro_winkler (~> 1.5)
+      kramdown (~> 2.3)
+      kramdown-parser-gfm (~> 1.1)
+      parser (~> 3.0)
+      reverse_markdown (>= 1.0.5, < 3)
+      rubocop (>= 0.52)
+      thor (~> 1.0)
+      tilt (~> 2.0)
+      yard (~> 0.9, >= 0.9.24)
+    spring (2.1.1)
+    spring-commands-rspec (1.0.4)
+      spring (>= 0.9.1)
+    spring-watcher-listen (2.0.1)
+      listen (>= 2.7, < 4.0)
+      spring (>= 1.2, < 3.0)
+    thor (1.1.0)
+    tilt (2.0.10)
+    timecop (0.9.4)
+    unicode-display_width (2.0.0)
+    yard (0.9.26)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  byebug
+  faraday
+  guard-rspec
+  jwt
+  multi_json
+  rake (~> 13.0)
+  rspec (~> 3.0)
+  rubocop (~> 1.7)
+  rubocop-rspec
+  sap-jwt-utils!
+  solargraph
+  spring-commands-rspec
+  spring-watcher-listen (~> 2.0.0)
+  timecop
+
+RUBY VERSION
+   ruby 2.7.3p183
+
+BUNDLED WITH
+   2.1.4