feat(ci): additional code/deps/security checks (#37)

To improve `CI` quality the following checks were added:

* compile warnings
* deprecated dependencies
* insecure dependencies
* unused dependencies
* code vulnerabilities

Also, to improve `CI` execution time, dependencies checks and lining were separated from the test pipeline.

Last, but not least, to make local development easier a `Dockerfile` was created to contain any system dependencies, and targets to handle database creation and migration were added.

Reviewed-on: #37

config/test.exs

@@ -16,7 +16,7 @@ config :wabanex, WabanexWeb.Endpoint,
   server: false
 
 # Print only warnings and errors during test
-config :logger, level: :warn
+config :logger, level: :warning
 
 config :junit_formatter,
   report_file: "test_report.xml",