Release copilot-cli: Release v0.4.0 · aws/copilot-cli

Environment variable strings in the manifests are now escaped (#1322)
Test command values in the pipeline manifests are now escaped (#1327)
The svc logs command does not skip log events anymore when you have multiple tasks running (#1328)
GitHub URL input for pipeline init now works on Windows (#1326)
Color only error strings for svc logs (#1350)

Support manual approvals in pipeline manifests (#1273)
You can now add requires_approval: true to pipeline.yml to add a manual approval button to your pipeline stage.
Enable filtering service logs on particular task IDs (#1334)
The svc logs command now supports a --tasks flag to filter on task IDs.
Support autoscaling for services (#1355)
Add a new option to service manifests to do automatic scaling of your services with target scaling policies.
You can now update the count field in service manifests from a number to the following map to enable autoscaling.
```
count:
  range: 1-10  # Specify a range for how many tasks you'd like to run in your service.
  cpu_percentage: 70     # To scale on average CPU.
  memory_percentage: 80  # Or, to scale on average Memory.
```
During deployments, Copilot maintains your desired count while autoscaling is active.
Display autoscaling alarms when running svc status (#1384)
Prompt for Dockerfile path if we cannot detect it in your git repository (#1341)
Support sticky sessions for load balanced web services (#1378)
Add a new stickiness: true option under the http field for load balanced web services to enable sticky sessions.

Thank you so much for the contributions 🙏 ❤️
@git823 (#1273, #1305, #1344, #1378)
@efimenkop (#1326)
@corykitchens (#1350)

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