feat(configmap): expose gzip-disable (#9505)

* docs(configmap): add link for gzip-min-length

* feat(configmap): expose gzip-disable

* test(e2e): cover gzip settings

* docs(configmap): simplify description with NGINX link

* refactor(configmap): simplify condition

internal/ingress/controller/config/config.go

@@ -438,6 +438,11 @@ type Configuration struct {
 	// Default: true
 	UseHTTP2 bool `json:"use-http2,omitempty"`
 
+	// Disables gzipping of responses for requests with "User-Agent" header fields matching any of
+	// the specified regular expressions.
+	// http://nginx.org/en/docs/http/ngx_http_gzip_module.html#gzip_disable
+	GzipDisable string `json:"gzip-disable,omitempty"`
+
 	// gzip Compression Level that will be used
 	GzipLevel int `json:"gzip-level,omitempty"`
 
@@ -794,7 +799,6 @@ func NewDefault() Configuration {
 	defGlobalExternalAuth := GlobalExternalAuth{"", "", "", "", "", append(defResponseHeaders, ""), "", "", "", []string{}, map[string]string{}, false}
 
 	cfg := Configuration{
-
 		AllowSnippetAnnotations:          true,
 		AllowBackendServerHeader:         false,
 		AnnotationValueWordBlocklist:     "",

internal/ingress/controller/template/configmap_test.go

@@ -64,6 +64,7 @@ func TestMergeConfigMapToStruct(t *testing.T) {
 		"access-log-path":               "/var/log/test/access.log",
 		"error-log-path":                "/var/log/test/error.log",
 		"use-gzip":                      "false",
+		"gzip-disable":                  "msie6",
 		"gzip-level":                    "9",
 		"gzip-min-length":               "1024",
 		"gzip-types":                    "text/html",
@@ -87,6 +88,7 @@ func TestMergeConfigMapToStruct(t *testing.T) {
 	def.ProxyReadTimeout = 1
 	def.ProxySendTimeout = 2
 	def.UseProxyProtocol = true
+	def.GzipDisable = "msie6"
 	def.GzipLevel = 9
 	def.GzipMinLength = 1024
 	def.GzipTypes = "text/html"