add coker ignore files

Devops/docs/docker-ops.md

@@ -0,0 +1,25 @@
+# Docker Troubleshooting
+
+### Error:
+
+```
+Docker | failed to solve with frontend dockerfile.v0: failed to create LLB definition: rpc error: code = Unknown desc
+```
+
+Solution:
+
+Factory reset docker and then,
+
+```
+rm ~/.docker/config.json
+```
+
+### Error:
+
+```
+No such file or directory for /var/lib/docker/overlay2
+```
+
+Solution:
+
+Remove node_modules from the Common, CommonServer, Model, CommonUI project.