ServiceMesh install WASM Plugin fails with error x509: certificate signed by unknown authority

Issue

• When using external registry for WASM plugin. The following error message is observed in the istio-proxy logs:

  {"level":"error","time":"XXXX-XX-XXTXX:XX:XX.XXXXXXZ","scope":"wasm","msg":"cannot fetch Wasm module https://registry.example.com/test/test-app:v0.0.1-alpha: wasm module download failed after 5 attempts, last error: Get \"https://registry.example.com/test/test-app:v0.0.1-alpha\": x509: certificate signed by unknown authority"}