Read os env vars

[DamandeepToor]

Description of the change

Adding environment variables to be read by the Gateway

Benefits

Example to add environment variables as secret variables and read via Gateway context variable syntax in Policy and in pre-selected configuration fields (e.g. JDBC Connection URL)

Drawbacks

Applicable issues

• fixes #

Additional information

Checklist

• [] Chart version bumped in Chart.yaml according to semver.
• [] Variables are documented in the README.md
• [] Title of the PR starts with chart name (e.g. [charts/gateway])
• [] If the chart contains a values-production.yaml apart from values.yaml, ensure that you implement the changes in both files

[Gazza7205]

The repo that you are trying to merge is 258 commits behind stable.

Do we need an additional template for this? AdditionalEnv/Secrets can already be configured here - https://github.com/CAAPIM/apim-charts/blob/stable/charts/gateway/values.yaml#L453-L461

For production environments we advise against exposing secrets in values.yaml - it's best to make use of existingSecrets where applicable

[DamandeepToor]

@Gazza7205 , oh may be you are right, let me merge the stable to this PR and add the env to https://github.com/CAAPIM/apim-charts/blob/stable/charts/gateway/values.yaml#L453-L461

[Gazza7205]

@Gazza7205 , oh may be you are right, let me merge the stable to this PR and add the env to https://github.com/CAAPIM/apim-charts/blob/stable/charts/gateway/values.yaml#L453-L461

Do we need an additional template for this given that we already have mechanisms in place?

Sounds like we just need to update the readme.

[DamandeepToor]

@Gazza7205 , oh may be you are right, let me merge the stable to this PR and add the env to https://github.com/CAAPIM/apim-charts/blob/stable/charts/gateway/values.yaml#L453-L461

Do we need an additional template for this given that we already have mechanisms in place?

Sounds like we just need to update the readme.

Updated ReadMe and revert other changes.

[Gazza7205]

@Gazza7205 , oh may be you are right, let me merge the stable to this PR and add the env to https://github.com/CAAPIM/apim-charts/blob/stable/charts/gateway/values.yaml#L453-L461

Do we need an additional template for this given that we already have mechanisms in place?
Sounds like we just need to update the readme.

Updated ReadMe and revert other changes.

It seems this readme is also from an old branch - could you review your changes and make sure they are against the latest stable commit?