# List what is in keystore
keytool -list -v -keystore /path/to/keystore.jks-storepass keystore_password
 
# Add certificate (public key) to keystore
keytool -import -alias certificate_alias -file project.crt  -keystore /path/to/project.jks -storepass keystore_password

#Export certificate (public key) from keystore
keytool -exportcert -rfc -file export.crt -keystore /path/to/project.jks -alias certificate_alias -storepass keystore_password