🔧(helm) add celery deployment

We need to configure a deployment dedicated to celery. It is a copy of
the backend one with modification made where it is specific to celery

src/helm/impress/values.yaml

@@ -320,6 +320,34 @@ backend:
     mount_path: /app/configuration/theme/
 
 
+  ## @param backend.celery.replicas Amount of celery replicas
+  ## @param backend.celery.command Override the celery container command
+  ## @param backend.celery.args Override the celery container args
+  ## @param backend.celery.resources Resource requirements for the celery container
+  ## @param backend.celery.probes.liveness.exec.command Override the celery container liveness probe command
+  ## @param backend.celery.probes.liveness.initialDelaySeconds Initial delay for the celery container liveness probe
+  ## @param backend.celery.probes.liveness.timeoutSeconds Timeout for the celery container liveness probe
+  ## @param backend.celery.probes.readiness.exec.command Override the celery container readiness probe command
+  ## @param backend.celery.probes.readiness.initialDelaySeconds Initial delay for the celery container readiness probe
+  ## @param backend.celery.probes.readiness.timeoutSeconds Timeout for the celery container readiness probe
+  celery:
+    replicas: 1
+    command: []
+    args: ["celery", "-A", "impress.celery_app", "worker", "-l", "INFO", "-n", "impress@%h"]
+    resources: {}
+    probes:
+      liveness:
+        exec:
+          command: ["/bin/sh", "-c", "celery -A impress.celery_app inspect ping -d impress@$HOSTNAME"]
+        initialDelaySeconds: 60
+        timeoutSeconds: 5
+      readiness:
+        exec:
+          command: ["/bin/sh", "-c", "celery -A impress.celery_app inspect ping -d impress@$HOSTNAME"]
+        initialDelaySeconds: 15
+        timeoutSeconds: 5
+
+
 
 ## @section frontend