Fix PostgreSQL SSL connection issue with sslmode=require in distroless images (#33523) (#33538)

Automatic Merge

server/build/passwd

@@ -1,4 +1,4 @@
 root:x:0:0:root:/root:/sbin/nologin
 nobody:x:65534:65534:nobody:/nonexistent:/sbin/nologin
 nonroot:x:65532:65532:nonroot:/home/nonroot:/sbin/nologin
-mattermost:x:2000:2000:nonroot:/home/nonroot:/sbin/nologin
+mattermost:x:2000:2000:mattermost:/mattermost:/sbin/nologin