feat: add filter by labels (#134)

You are now able to use labels on containers and services such as `--sablier.enable=true` and `--sablier.group=mygroup` to select groups.

plugins/nginx/README.md

@@ -69,6 +69,7 @@ You can configure the middleware behavior with the following variables:
 
 - `set $sablierUrl` The internal routing to reach Sablier API
 - `set $sablierNames` Comma separated names of containers/services/deployments etc.
+- `set $sablierGroup` Group name to use to filter by label, ignored if sablierNames is set
 - `set $sablierSessionDuration` The session duration after which containers/services/deployments instances are shutdown
 - `set $sablierNginxInternalRedirect` The internal location for the service to redirect e.g. @nginx
 

plugins/nginx/njs/sablier.js

@@ -22,6 +22,7 @@ function call(r) {
  * @typedef {Object} SablierConfig
  * @property {string} sablierUrl
  * @property {string} names
+ * @property {string} group
  * @property {string} sessionDuration
  * @property {string} internalRedirect
  * @property {string} displayName
@@ -41,6 +42,7 @@ function createConfigurationFromVariables(r) {
   return {
     sablierUrl: r.variables.sablierUrl,
     names: r.variables.sablierNames,
+    group: r.variables.sablierGroup,
     sessionDuration: r.variables.sablierSessionDuration,
     internalRedirect: r.variables.sablierNginxInternalRedirect,