Resolve precheck context passing

[nerdalert]

• Fixed context argument handling in CLI tool by constructing command with fmt.Sprintf instead of arg slicing.
• There is probably a bug in upstream on this since other arguments don't require bypassing the Go cmd slice pattern. --quick-question works fine with slice construction but --context does not.
• Output from a job with the page showing context in the answer: https://brent-instruct-lab-dev.s3.us-east-1.amazonaws.com/precheck-pr-11-6c08042b81fc7e41d3d69f3f115c4569ca03ac8d-job-4/index.html
• Here is the logging use to generate output in the s3 bucket above. Note, we should probably visit how to better the output to be more detailed and complete:

2024-05-02T03:23:43.835Z    INFO    cmd/generate.go:342 Running the precheck command: /usr/local/bin/ilab chat --quick-question can you solve the following riddle? Two turkeys in front of the turkey, two turkeys behind the turkey, tell me how many total turkeys? --context Form HOTDOGS HAMBURGERS PANCAKES --tls-insecure --endpoint-url https://merlinite-7b-vllm-openai.apps.fmaas-backend.fmaas.res.ibm.com/v1 --model /shared_model_storage/transformers_cache/models--ibm--merlinite-7b/snapshots/233d12759d5bb9344231dafdb51310ec19d79c0e
2024-05-02T03:23:49.463Z    INFO    cmd/generate.go:342 Running the precheck command: /usr/local/bin/ilab chat --quick-question question-2 can you solve the following riddle? Two turkeys in front of the turkey, two turkeys behind the turkey, tell me how many total turkeys? --context HOTDOGS HAMBURGERS PANCAKES HOTDOGS --tls-insecure --endpoint-url https://merlinite-7b-vllm-openai.apps.fmaas-backend.fmaas.res.ibm.com/v1 --model /shared_model_storage/transformers_cache/models--ibm--merlinite-7b/snapshots/233d12759d5bb9344231dafdb51310ec19d79c0e
2024-05-02T03:23:54.234Z    INFO    cmd/generate.go:342 Running the precheck command: /usr/local/bin/ilab chat --quick-question question-3 can you solve the following riddle? Two turkeys in front of the turkey, two turkeys behind the turkey, tell me how many total turkeys? --context HOTDOGS HAMBURGERS PANCAKES HOTDOGS --tls-insecure --endpoint-url https://merlinite-7b-vllm-openai.apps.fmaas-backend.fmaas.res.ibm.com/v1 --model /shared_model_storage/transformers_cache/models--ibm--merlinite-7b/snapshots/233d12759d5bb9344231dafdb51310ec19d79c0e
2024-05-02T03:24:00.355Z    INFO    cmd/generate.go:342 Running the precheck command: /usr/local/bin/ilab chat --quick-question question-4 can you solve the following riddle? Two turkeys in front of the turkey, two turkeys behind the turkey, tell me how many total turkeys? --context HOTDOGS HAMBURGERS PANCAKES HOTDOGS --tls-insecure --endpoint-url https://merlinite-7b-vllm-openai.apps.fmaas-backend.fmaas.res.ibm.com/v1 --model /shared_model_storage/transformers_cache/models--ibm--merlinite-7b/snapshots/233d12759d5bb9344231dafdb51310ec19d79c0e
2024-05-02T03:24:08.244Z    INFO    cmd/generate.go:342 Running the precheck command: /usr/local/bin/ilab chat --quick-question question-5 can you solve the following riddle? Two turkeys in front of the turkey, two turkeys behind the turkey, tell me how many total turkeys? --context HOTDOGS HAMBURGERS PANCAKES HOTDOGS --tls-insecure --endpoint-url https://merlinite-7b-vllm-openai.apps.fmaas-backend.fmaas.res.ibm.com/v1 --model /shared_model_storage/transformers_cache/models--ibm--merlinite-7b/snapshots/233d12759d5bb9344231dafdb51310ec19d79c0e

• Also added ps to the worker image.

Closes #306

[nerdalert]

@mingxzhao have we opened a bug in instructlab yet? I will pop one if not. I can replicate the bug with just the cli. I had left it as is in the patch.

Example:

[root@f27bd496fb8f data]# /usr/local/bin/ilab chat --quick-question can you solve the following riddle? Two turkeys in front of the turkey, two turkeys behind the turkey, tell me how many total turkeys?  --context HOTDOGS HAMBURGERS PANCAKES
INFO 2024-05-02 20:30:58,031 chat.py:479 Context HOTDOGS not found in the config file. Using default.

Only reluctance to patch it is when it gets fixed upstream there will be a float period but since this is time sensitive I'll add a buffer word. If you can help us track it we can hopefully not break for long when it gets fixed. Ty!

[mingxzhao]

No no bug opened yet, and I will keep an eye out for a fix when merged.