Add echo image to avoid building and installing dependencies in each test (#5028)

images/echo/Dockerfile

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+FROM openresty/openresty:1.15.8.2-alpine
+
+RUN apk add -U perl curl \
+  && opm get bungle/lua-resty-template
+
+COPY nginx.conf /usr/local/openresty/nginx/conf/nginx.conf

images/echo/Makefile

@@ -0,0 +1,33 @@
+# Copyright 2020 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Docker image for e2e testing.
+
+# Use the 0.0 tag for testing, it shouldn't clobber any release builds
+TAG ?= 0.0
+
+REGISTRY ?= ingress-controller
+DOCKER ?= docker
+
+IMGNAME = echo
+IMAGE = $(REGISTRY)/$(IMGNAME)
+
+container:
+	$(DOCKER) buildx build \
+		--load \
+		--platform linux/amd64 \
+		-t $(IMAGE):$(TAG) .
+
+clean:
+	$(DOCKER) rmi -f $(IMAGE):$(TAG) || true

images/echo/nginx.conf

@@ -0,0 +1,93 @@
+env HOSTNAME;
+env NODE_NAME;
+env POD_NAME;
+env POD_NAMESPACE;
+env POD_IP;
+
+daemon off;
+
+events {
+    worker_connections  1024;
+}
+
+http {
+	default_type 'text/plain';
+	client_max_body_size 0;
+
+	init_by_lua_block {
+		local template = require "resty.template"
+
+		tmpl = template.compile([[
+
+Hostname: {*os.getenv("HOSTNAME") or "N/A"*}
+
+Pod Information:
+{% if os.getenv("POD_NAME") then %}
+	node name:	{*os.getenv("NODE_NAME") or "N/A"*}
+	pod name:	{*os.getenv("POD_NAME") or "N/A"*}
+	pod namespace:	{*os.getenv("POD_NAMESPACE") or "N/A"*}
+	pod IP:	{*os.getenv("POD_IP") or "N/A"*}
+{% else %}
+	-no pod information available-
+{% end %}
+
+Server values:
+	server_version=nginx: {*ngx.var.nginx_version*} - lua: {*ngx.config.ngx_lua_version*}
+
+Request Information:
+	client_address={*ngx.var.remote_addr*}
+	method={*ngx.req.get_method()*}
+	real path={*ngx.var.request_uri*}
+	query={*ngx.var.query_string or ""*}
+	request_version={*ngx.req.http_version()*}
+	request_scheme={*ngx.var.scheme*}
+	request_uri={*ngx.var.scheme.."://"..ngx.var.host..":"..ngx.var.server_port..ngx.var.request_uri*}
+
+Request Headers:
+{% for i, key in ipairs(keys) do %}
+	{% local val = headers[key] %}
+	{% if type(val) == "table" then %}
+		{% for i = 1,#val do %}
+	{*key*}={*val[i]*}
+		{% end %}
+	{% else %}
+	{*key*}={*val*}
+	{% end %}
+{% end %}
+
+Request Body:
+{*ngx.var.request_body or "	-no body in request-"*}
+]])
+	}
+
+	server {
+		listen 80 default_server reuseport;
+
+		server_name _;
+
+		keepalive_timeout 620s;
+
+		location / {
+			lua_need_request_body on;
+
+			header_filter_by_lua_block {
+				if ngx.var.arg_hsts == "true" then
+					ngx.header["Strict-Transport-Security"] = "max-age=3600; preload"
+				end
+			}
+
+			content_by_lua_block {
+				ngx.header["Server"] = "echoserver"
+
+				local headers = ngx.req.get_headers()
+				local keys = {}
+				for key, val in pairs(headers) do
+					table.insert(keys, key)
+				end
+				table.sort(keys)
+
+				ngx.say(tmpl({os=os, ngx=ngx, keys=keys, headers=headers}))
+			}
+		}
+	}
+}