Add Ballerina config variable naming convention note

[Skynettheone]

Summary

Fixes #158.

The "Add an environment variable to your container" section didn't mention the naming convention required for Ballerina configurable variables, so users setting these via environment variables had no guidance on the expected key format.

Change

Added a note after the existing .env file import tip, explaining that Ballerina configurable variables should use the BAL_CONFIG_VAR_key=value naming convention, as requested in the issue.

Test plan

• Confirmed the new note is inserted in the correct location and uses the same admonition formatting (!!!info "Note") as the rest of the document.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 694e610c-d5bb-4497-a9c7-4a4eddff959d

📥 Commits

Reviewing files that changed from the base of the PR and between 2928db6 and 39582a8.

📒 Files selected for processing (1)

• en/docs/devops-and-ci-cd/manage-configurations-and-secrets.md

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📝 Walkthrough

Summary

• Document the BAL_CONFIG_VAR_key=value naming convention for Ballerina configurable variables.
• Link to the Ballerina guide for additional configuration details.

Walkthrough

The documentation now states that environment variables for Ballerina configurable variables must use the BAL_CONFIG_VAR_key=value naming convention.

Suggested reviewers: pcnfernando

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the issue, change, and test plan, but it omits most required template sections, including release, documentation, security, and test-environment details.	Complete the required template sections, or mark non-applicable sections as N/A with brief explanations.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the documentation change for the Ballerina configuration variable naming convention.
Linked Issues check	✅ Passed	The change satisfies [#158] by adding the BAL_CONFIG_VAR_key=value format and linking to the Ballerina configurable variables guide.
Out of Scope Changes check	✅ Passed	The pull request contains only the documentation note required by [#158] and no unrelated changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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