helm: Set RUST_BACKTRACE to 1 for all containers

Default RUST_BACKTRACE to 1 for all containers in the helm chart, so we
get backtraces for panics

Change-Id: I811a30ca5c8f80a6193e4049132a67f1a7835ee4
Reviewed-on: https://gerrit.readyset.name/c/readyset/+/4742
Tested-by: Buildkite CI
Reviewed-by: Ian Meyer <ian@readyset.io>

helm/readyset/values.yaml

@@ -533,6 +533,9 @@ readyset:
       # -- Toggles query logging. Set to 0 (off) or 1 (on).
       QUERY_LOG: 'true'
 
+      # -- Enable backtraces in panic outputs
+      RUST_BACKTRACE: '1'
+
     resources:
       # -- Resource requests and limits for ReadySet adapters.
       requests: