mintmaker: set GOMEMLIMIT to avoid controller OOMKilled crashes (#7576)

Set GOMEMLIMIT=7GiB so the Go runtime respects Kubernetes memory limits.
Although the controller is allocated 8GiB memory, in large clusters (e.g.,
p02 with 5000+ components) it can still be OOMKilled, possibly due to
the Go runtime ignoring container limits.

Author: qixiang

components/mintmaker/production/base/manager_patch.yaml

@@ -15,3 +15,6 @@ spec:
           requests:
             cpu: 100m
             memory: 8Gi
+        env:
+        - name: GOMEMLIMIT
+          value: "7GiB"