tpl is build for generating config files from templates using simple or complex (lists, maps, objects) shell environment variables. Since the binary has zero dependencies it is build for docker but you can use it across all platform and operating systems.
tpl uses sprig to extend golang's template capabilities.
Check the test section and have a look at test.tpl (template) and text.txt (result) in test folder for examples.
Just download the binary for your OS and arch from the releases page.
If you want to use it inside your docker image you can add this to your Dockerfile:
ADD https://github.com/schneidexe/tpl/releases/download/v0.6.1/tpl-linux-amd64 /bin/tpl
RUN chmod a+x /bin/tpl
Local:
go get github.com/schneidexe/tpl
X-Platform:
go get github.com/mitchellh/gox
gox -osarch="darwin/amd64 darwin/arm64 linux/386 linux/amd64 linux/arm64 windows/386 windows/amd64"
./test.sh