[Serve] Print out the yaml on update in the controller log

[dtran24]

Fixes #3056

Tested (run the relevant ones):

• Code formatting: bash format.sh
• Any manual or new tests for this PR (please specify below)
  • Getting output on sky serve update commands. Output for multiline strings can be a little off though. For example, with yaml

service:
  readiness_probe: /
  replicas: 3

resources:
  cloud: aws
  ports: 8080
  cpus: 2

setup: |
  echo "hello world"
  echo "foo bar"

workdir: .

run: python -m http.server 8080

can see the output look like

I 02-26 05:16:43 subprocess_utils.py:204] name: sky-service-39a9
I 02-26 05:16:43 subprocess_utils.py:204] 
I 02-26 05:16:43 subprocess_utils.py:204] resources:
I 02-26 05:16:43 subprocess_utils.py:204]   cloud: AWS
I 02-26 05:16:43 subprocess_utils.py:204]   cpus: '2'
I 02-26 05:16:43 subprocess_utils.py:204]   disk_size: 256
I 02-26 05:16:43 subprocess_utils.py:204]   ports:
I 02-26 05:16:43 subprocess_utils.py:204]   - '8080'
I 02-26 05:16:43 subprocess_utils.py:204] 
I 02-26 05:16:43 subprocess_utils.py:204] service:
I 02-26 05:16:43 subprocess_utils.py:204]   readiness_probe:
I 02-26 05:16:43 subprocess_utils.py:204]     path: /
I 02-26 05:16:43 subprocess_utils.py:204]     initial_delay_seconds: 1200
I 02-26 05:16:43 subprocess_utils.py:204]   replica_policy:
I 02-26 05:16:43 subprocess_utils.py:204]     min_replicas: 3
I 02-26 05:16:43 subprocess_utils.py:204] 
I 02-26 05:16:43 subprocess_utils.py:204] num_nodes: 1
I 02-26 05:16:43 subprocess_utils.py:204] 
I 02-26 05:16:43 subprocess_utils.py:204] setup: 'echo "hello world"
I 02-26 05:16:43 subprocess_utils.py:204] 
I 02-26 05:16:43 subprocess_utils.py:204]   echo "foo bar"
I 02-26 05:16:43 subprocess_utils.py:204] 
I 02-26 05:16:43 subprocess_utils.py:204]   '
I 02-26 05:16:43 subprocess_utils.py:204] 
I 02-26 05:16:43 subprocess_utils.py:204] run: python -m http.server 8080
I 02-26 05:16:43 subprocess_utils.py:204] 
I 02-26 05:16:43 subprocess_utils.py:204] file_mounts:
I 02-26 05:16:43 subprocess_utils.py:204]   ~/sky_workdir:
I 02-26 05:16:43 subprocess_utils.py:204]     source: s3:https://skypilot-workdir-davidtran-fabe0f23
I 02-26 05:16:43 subprocess_utils.py:204]     store: S3
I 02-26 05:16:43 subprocess_utils.py:204]     persistent: false
I 02-26 05:16:43 subprocess_utils.py:204]     mode: COPY
I 02-26 05:16:43 subprocess_utils.py:204]     _force_delete: true

Clearly better than previous state (i.e. no logging), but currently not sure why some unnecessary single quotes and new lines are showing up

• All smoke tests: pytest tests/test_smoke.py
• Relevant individual smoke tests: pytest tests/test_smoke.py::test_fill_in_the_name
• Backward compatibility tests: bash tests/backward_comaptibility_tests.sh

[dtran24]

Requesting review @Michaelvll @cblmemo

[cblmemo]

Could you try this code snippet:

import yaml
def literal_presenter(dumper, data):
    if '\n' in data:
        return dumper.represent_scalar('tag:yaml.org,2002:str', data, style='|')
    return dumper.represent_scalar('tag:yaml.org,2002:str', data)
yaml.add_representer(str, literal_presenter, Dumper=yaml.SafeDumper)
print(yaml.safe_dump(task.to_yaml_config(), sort_keys=False))

[dtran24]

@cblmemo I still get the same output that I mentioned in the PR description when I run it on the controller

[cblmemo]

@cblmemo I still get the same output that I mentioned in the PR description when I run it on the controller

could you push the latest code to this branch?