*: enable default linters (#1334)

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

.golangci.yml

@@ -1,8 +1,12 @@
 run:
   modules-download-mode: vendor
 
-# Run only staticcheck for now. Additional linters will be enabled one-by-one.
-linters:
-  enable:
-  - staticcheck
-  disable-all: true
+issues:
+  exclude-rules:
+  - path: _test.go
+    linters:
+    - errcheck
+
+linters-settings:
+  errcheck:
+    exclude: scripts/errcheck_excludes.txt

scripts/errcheck_excludes.txt

@@ -0,0 +1,2 @@
+// Used in HTTP handlers, any error is handled by the server itself.
+(net/http.ResponseWriter).Write