Build-time environment variables

These variables are passed to the app during the image build process. They cannot be re-defined during the run-time.

Variable	Type	Description	Optional	Example value
NEXT_PUBLIC_GIT_COMMIT_SHA	`string`	SHA of the latest commit in the branch from which image is built	false	`29d0613e`
NEXT_PUBLIC_GIT_TAG	`string`	Git tag of the latest commit in the branch from which image is built	true	`v1.0.0`
NEXT_OPEN_TELEMETRY_ENABLED	`boolean`	Enables OpenTelemetry SDK	true	`true`
NEXT_PUBLIC_ICON_SPRITE_HASH	`string`	Hash post-fix of the SVG sprite file (generated automatically during the sprite build)	`08be4b10`	`true`