[TASK] Prepare for deployment in OpenShift

[akshadpai]

Description

We are migrating the back-end infrastructure into our new OpenShift cluster. We will need to make some changes for the deployment to succeed.

Acceptance Criteria

• Add app-env.json: We need to explicitly define all environment variables that we use in a file called app-env.json for the infrastructure to provide them to our containers. This file should be in the following format:

{
    "app_secret": {
        "<SECRET_ENVIRONMENT_VARIABLE>": "<DO NOT PUT ACTUAL SECRET VALUES HERE. Provide a hint or leave empty if the environment variable is optional>",
        ...
    },
    "app_config":{
        "<NON_SECRET_ENVIRONMENT_VARIABLE>": "<Default value or hint. Leave empty if none apply or the environment variable is optional>",
        ...
    }
}

• Create port environment variable if none exists. Do not specify port in Dockerfile.
• Ensure that https://github.com/rokwire/logging-library-go is updated to latest version. Apply the following logger options to suppress health checks from OpenShift.

loggerOpts := logs.LoggerOpts{SuppressRequests: logs.NewStandardHealthCheckHTTPRequestProperties(serviceID + "/version")}

• Update CONVENTIONS.md releases section to reflect OpenShift release process as described here: https://github.com/rokwire/core-building-block/edit/develop/CONVENTIONS.md