feat: add support for endpoints requiring client authentication using PKI (#393)
* feat: add support for endpoints requiring client authentication using PKI
This enables a global mTLS context for client requests using the native fetch
API. It can be used when custom endpoints require client authentication via
PKI.
* fix: Dockerfile syntax required for macOS
Set the Dockerfile syntax explictly to enable new features in Dockerfile.
The default syntax uses by Docker Desktop for macOS does not include support
for `--link` in the COPY command for example.