Add SRC env subtitution to the getLayer Module

[simon-leech]

The replacement of keys ${HOST} for example was previously only happening in the getLocale module. This PR adds it to the getLayer module too - which means that file paths within for example layer.meta can substitute ENV variables.

The below would now resolve to whatever SRC_HOST is defined to in the ENV settings

  "meta": "<a target='_blank' href='${HOST}/...`>Click here for User Guide</a></div>",

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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