chore: Rename `$container` to `$containers`

The value is actually a slice/array of containers so it should be
pluralized.

nginx.tmpl

@@ -397,15 +397,15 @@ server {
 		{{ $network_tag := or (first (groupByKeys $containers "Env.NETWORK_ACCESS")) "external" }}
 		{{ template "location" (dict "Path" "/" "Proto" $proto "Upstream" $upstream_name "Host" $host "VhostRoot" $vhost_root "Dest" "" "NetworkTag" $network_tag) }}
 	{{ else }}
-		{{ range $path, $container := $paths }}
+		{{ range $path, $containers := $paths }}
 			{{/* Get the VIRTUAL_PROTO defined by containers w/ the same vhost-vpath, falling back to "http" */}}
-			{{ $proto := trim (or (first (groupByKeys $container "Env.VIRTUAL_PROTO")) "http") }}
+			{{ $proto := trim (or (first (groupByKeys $containers "Env.VIRTUAL_PROTO")) "http") }}
 
 			{{/* Get the NETWORK_ACCESS defined by containers w/ the same vhost, falling back to "external" */}}
-			{{ $network_tag := or (first (groupByKeys $container "Env.NETWORK_ACCESS")) "external" }}
+			{{ $network_tag := or (first (groupByKeys $containers "Env.NETWORK_ACCESS")) "external" }}
 			{{ $sum := sha1 $path }}
 			{{ $upstream := printf "%s-%s" $upstream_name $sum }}
-			{{ $dest := (or (first (groupByKeys $container "Env.VIRTUAL_DEST")) "") }}
+			{{ $dest := (or (first (groupByKeys $containers "Env.VIRTUAL_DEST")) "") }}
 			{{ template "location" (dict "Path" $path "Proto" $proto "Upstream" $upstream "Host" $host "VhostRoot" $vhost_root "Dest" $dest "NetworkTag" $network_tag) }}
 		{{ end }}
 		{{ if (not (contains $paths "/")) }}
@@ -445,15 +445,15 @@ server {
 		{{ $network_tag := or (first (groupByKeys $containers "Env.NETWORK_ACCESS")) "external" }}
 		{{ template "location" (dict "Path" "/" "Proto" $proto "Upstream" $upstream_name "Host" $host "VhostRoot" $vhost_root "Dest" "" "NetworkTag" $network_tag) }}
 	{{ else }}
-		{{ range $path, $container := $paths }}
+		{{ range $path, $containers := $paths }}
 			{{/* Get the VIRTUAL_PROTO defined by containers w/ the same vhost-vpath, falling back to "http" */}}
-			{{ $proto := trim (or (first (groupByKeys $container "Env.VIRTUAL_PROTO")) "http") }}
+			{{ $proto := trim (or (first (groupByKeys $containers "Env.VIRTUAL_PROTO")) "http") }}
 
 			{{/* Get the NETWORK_ACCESS defined by containers w/ the same vhost, falling back to "external" */}}
-			{{ $network_tag := or (first (groupByKeys $container "Env.NETWORK_ACCESS")) "external" }}
+			{{ $network_tag := or (first (groupByKeys $containers "Env.NETWORK_ACCESS")) "external" }}
 			{{ $sum := sha1 $path }}
 			{{ $upstream := printf "%s-%s" $upstream_name $sum }}
-			{{ $dest := (or (first (groupByKeys $container "Env.VIRTUAL_DEST")) "") }}
+			{{ $dest := (or (first (groupByKeys $containers "Env.VIRTUAL_DEST")) "") }}
 			{{ template "location" (dict "Path" $path "Proto" $proto "Upstream" $upstream "Host" $host "VhostRoot" $vhost_root "Dest" $dest "NetworkTag" $network_tag) }}
 		{{ end }}
 		{{ if (not (contains $paths "/")) }}