setup github actions

.golangci.yml

@@ -0,0 +1,22 @@
+run:
+  timeout: 5m
+
+linters:
+  enable:
+    - deadcode
+    - errcheck
+    - gosimple
+    - govet
+    - ineffassign
+    - staticcheck
+    - structcheck
+    - typecheck
+    - unused
+    - varcheck
+    - gofmt
+  disable-all: true
+
+linters-settings:
+  gofmt:
+    # simplify code: gofmt with `-s` option, true by default
+    simplify: false