Log JSON in Kubernetes

If you set LOG_JSON=true, we'll output JSON from the tracing subscriber instead of pretty-printing trace output.

Co-Authored-By: Antonio Scandurra <me@as-cii.com>

crates/collab/k8s/manifest.template.yml

@@ -83,6 +83,8 @@ spec:
                   key: token
             - name: RUST_LOG
               value: ${RUST_LOG}
+            - name: LOG_JSON
+              value: "true"
             - name: HONEYCOMB_DATASET
               value: "collab"
             - name: HONEYCOMB_API_KEY