ci(golangci): enable comprehensive linting and update variable initialization

- Add a `.golangci.yaml` configuration file with various linters enabled and specific settings for `gosec` and `perfsprint`.
- Change `isTimeout` from being initialized to `true` to being declared as a `bool` variable without an initial value in `plugin.go`.

Signed-off-by: appleboy <appleboy.tw@gmail.com>

.golangci.yaml

@@ -0,0 +1,42 @@
+run:
+  timeout: 5m
+linters:
+  enable:
+    - asciicheck
+    - durationcheck
+    - errcheck
+    - errorlint
+    - exportloopref
+    - gci
+    - gofmt
+    - goimports
+    - gosec
+    - misspell
+    - nakedret
+    - nilerr
+    - nolintlint
+    - perfsprint
+    - revive
+    - usestdlibvars
+    - wastedassign
+
+linters-settings:
+  gosec:
+    # To select a subset of rules to run.
+    # Available rules: https://github.com/securego/gosec#available-rules
+    # Default: [] - means include all rules
+    includes:
+      - G102
+      - G106
+      - G108
+      - G109
+      - G111
+      - G112
+      - G201
+      - G203
+  perfsprint:
+    err-error: true
+    errorf: true
+    int-conversion: true
+    sprintf1: true
+    strconcat: true

plugin.go

@@ -137,7 +137,7 @@ func (p Plugin) exec(host string, wg *sync.WaitGroup, errChannel chan error) {
 		return
 	}
 	// read from the output channel until the done signal is passed
-	isTimeout := true
+	var isTimeout bool
 loop:
 	for {
 		select {