fix(backend): Define executionmanager hostname for local docker-mode

[majdyz]

When running in local docker-mode, the executor is unable to access the pyro server of the execution manager with this error:
Node execution failed with error cannot connect to ('localhost', 8002): [Errno 111] Connection refused.

Changes 🏗️

Define executionmanager hostname for local docker-mode

Checklist 📋

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
• I have tested my changes according to the test plan:
  • ...

Example test plan

• Create from scratch and execute an agent with at least 3 blocks
• Import an agent from file upload, and confirm it executes correctly
• Upload agent to marketplace
• Import an agent from marketplace and confirm it executes correctly
• Edit an agent from monitor, and confirm it executes correctly

For configuration changes:

• .env.example is updated or already compatible with my changes
• docker-compose.yml is updated or already compatible with my changes
• I have included a list of my configuration changes in the PR description (under Changes)

Examples of configuration changes

• Changing ports
• Adding new services that need to communicate with each other
• Secrets or environment variable changes
• New or infrastructure changes such as databases

[qodo-merge-pro]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 1 🔵⚪⚪⚪⚪

🧪 No relevant tests

🔒 Security concerns Sensitive information exposure: The PR contains a hardcoded encryption key in the docker-compose file (ENCRYPTION_KEY). While marked as not for production use, it's recommended to move this to a secure configuration management system or environment variable to prevent accidental use in production environments.

⚡ Recommended focus areas for review Configuration Validation Verify that the EXECUTIONMANAGER_HOST value of '0.0.0.0' is the correct binding address for the execution manager service in docker mode

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