feat: Replace path stripping with variable

This commit removes the automatic path stripping and replaces it with a
user configurable environment variable. This can be set individually for
each container.

test/test_virtual-path/test_custom_conf.yml

@@ -6,6 +6,7 @@ web1:
     WEB_PORTS: "81"
     VIRTUAL_HOST: "nginx-proxy.test"
     VIRTUAL_PATH: "/web1/"
+    VIRTUAL_DEST: "/"
 
 web2:
   image: web
@@ -15,6 +16,8 @@ web2:
     WEB_PORTS: "82"
     VIRTUAL_HOST: "nginx-proxy.test"
     VIRTUAL_PATH: "/web2/"
+    VIRTUAL_DEST: "/"
+
 sut:
   image: nginxproxy/nginx-proxy:test
   environment:

test/test_virtual-path/test_virtual_paths.yml

@@ -15,6 +15,7 @@ web1:
     WEB_PORTS: "81"
     VIRTUAL_HOST: "nginx-proxy.test"
     VIRTUAL_PATH: "/web1/"
+    VIRTUAL_DEST: "/"
 
 web2:
   image: web
@@ -24,6 +25,7 @@ web2:
     WEB_PORTS: "82"
     VIRTUAL_HOST: "nginx-proxy.test"
     VIRTUAL_PATH: "/web2/"
+    VIRTUAL_DEST: "/"
 
 web3:
   image: web