Refactor build of docker images

images/echo/rootfs/Dockerfile

@@ -0,0 +1,14 @@
+FROM quay.io/kubernetes-ingress-controller/nginx:e3c49c52f4b74fe47ad65d6f3266a02e8b6b622f
+
+RUN apk add -U perl curl make unzip
+
+RUN wget -O /tmp/luarocks.tgz https://github.com/luarocks/luarocks/archive/v3.3.1.tar.gz \
+  && tar -C /tmp -xzf /tmp/luarocks.tgz \
+  && cd /tmp/luarocks* \
+  && ./configure \
+  && make install \
+  && rm -rf /tmp/*
+
+RUN luarocks install lua-resty-template
+
+COPY nginx.conf /etc/nginx/nginx.conf

images/echo/rootfs/nginx.conf

@@ -0,0 +1,91 @@
+env HOSTNAME;
+env NODE_NAME;
+env POD_NAME;
+env POD_NAMESPACE;
+env POD_IP;
+
+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}))
+			}
+		}
+	}
+}