test: raise unit test coverage above 80% (add CLI, DB, SSH, output, keyring tests) (#17)

Author: zx06

.golangci.yml

@@ -1,11 +1,12 @@
 version: "2"
 
-run:
-  timeout: 5m
-
-linters:
-  default: standard
-  settings:
+run:
+  timeout: 5m
+  tests: false
+
+linters:
+  default: standard
+  settings:
     errcheck:
       exclude-functions:
         - (*database/sql.Rows).Close