Enable more linters

Signed-off-by: Loic Devulder <ldevulder@suse.com>

.golangci.yml

@@ -19,9 +19,13 @@ linters:
     - dupl # check duplicated code
     - goconst # check strings that can turn into constants
     - gofmt # check fmt
-    - goheader # Check license headers, only checks files in current year
+    - goheader # check license headers, only checks files in current year
     - goimports # check imports
     - gocyclo # check complexity
+    - gocritic # provides diagnostics that check for bugs, performance and style issues
+    - gosec # inspects source code for security problems.
+    - unparam # reports unused function parameters
+    - errorlint # find code that will cause problems with error wrapping scheme
 linters-settings:
   gocyclo:
     min-complexity: 20 # default is 30 which is too high