temporary fix for #426

using legacy open ssl provider for fixing `"error:0308010C:digital envelope routines::unsupported"` error.

See https://stackoverflow.com/questions/69692842/error-message-error0308010cdigital-envelope-routinesunsupported

We need to upgrade Angular version.

Makefile

@@ -98,6 +98,7 @@ endif
 # reduce logging, disable angular-cli analytics for ci environment
 binary-frontend: export NPM_CONFIG_LOGLEVEL = warn
 binary-frontend: export NG_CLI_ANALYTICS = false
+binary-frontend: export NODE_OPTIONS = --openssl-legacy-provider
 binary-frontend:
 	cd webapp/frontend
 	npm install -g @angular/cli@9.1.4