feat: add staging env

values.staging.yaml

+# Default values for CDB app.
+# This is a YAML-formatted file.
+# Declare variables to be passed into your templates.
+# We have only done front for now
+name: cdb
+
+pg:
+  enabled: true
+  port: 5432
+  image:
+    repository: registry.takima.io/school/proxy/postgres
+    tag: latest
+  replicaCount: 1
+
+api:
+  enabled: true
+  image:
+    repository: registry.gitlab.com/takima-school/images/cdb/api
+    tag: latest
+  replicaCount: 1
+  ingress:
+    tlsEnabled: true
+    host: api-staging.bmaignan.takima.school
+
+front:
+  enabled: true
+  image:
+    repository: registry.gitlab.com/takima-school/images/cdb/www
+    tag: latest
+  replicaCount: 1
+  ingress:
+    tlsEnabled: true
+    host: www-staging.bmaignan.takima.school
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