[IOPLT-703] Add reference to APIM key and add new variables

[kin0992]

The new variables have been introduced to migrate backend traffic from the Azure functions to the APIM, allowing to do that with no downtime

List of changes

• Add TRIAL_SYSTEM_APIM_URL env variable containing the Trial System APIM base URL
• Add TRIAL_SYSTEM_APIM_KEY env variable containing the API key the backend will use to authenticate
• Add TRIAL_SYSTEM_APIM_BASE_PATH env variable
• Add reference to app_backend_TRIAL_SYSTEM_APIM_KEY key vault secret

Motivation and context

The traffic of the backend will be moved from the Trial System's Azure function to the APIM.

Note

The legacy environment variables are still there to guarantee no downtime.
When the traffic is totally migrated, we can proceed to new PRs to remove old env variables.

Type of changes

• Add new resources
• Update configuration to existing resources
• Remove existing resources

Env to apply

• DEV
• UAT
• PROD

Does this introduce a change to production resources with possible user impact?

• Yes, users may be impacted applying this change
• No

Does this introduce an unwanted change on infrastructure? Check terraform plan execution result

• Yes
• No

Other information

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If PR is partially applied, why? (reserved to mantainers)

How to apply

After PR is approved

1. run deploy pipeline from Azure DevOps io-platform-iac-projects
2. select PR branch
3. wait for approval

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud