install java keystore tool and export client.crt, and client.key

 install java keystore on ubuntu:

https://stackoverflow.com/questions/16333635/keytool-error-bash-keytool-command-not-found

sudo apt install openjdk-8-jre-headless

export :

https://security.stackexchange.com/questions/3779/how-can-i-export-my-private-key-from-a-java-keytool-keystore

keytool -importkeystore \
    -srckeystore <keystore>\
    -destkeystore keystore.p12 \
    -deststoretype PKCS12 \
    -deststorepass 123456 \
    -destkeypass 123456
	
	
	
Export certificate using openssl:
openssl pkcs12 -in keystore.p12  -nokeys -out cert.pem
Export unencrypted private key:
openssl pkcs12 -in keystore.p12  -nodes -nocerts -out key.pem
	
	
curl bypass server cert validation -k:

https://stackoverflow.com/questions/55561615/curl-with-mutual-authentication

curl --key client.key --cert client.crt --cacert bundle.pem -X GET -v https://x.x.x.x:xxxx/folder/endpoint

generate keystore from crt and key

https://stackoverflow.com/questions/11952274/how-can-i-create-keystore-from-an-existing-certificate-abc-crt-and-abc-key-fil

The easiest is probably to create a PKCS#12 file using OpenSSL:
openssl pkcs12 -export -in abc.crt -inkey abc.key -out abc.p12
You should be able to use the resulting file directly using the PKCS12 keystore type.
If you really need to, you can convert it to JKS using keytool -importkeystore (available in keytool from Java 6):
keytool -importkeystore -srckeystore abc.p12 \
        -srcstoretype PKCS12 \
        -destkeystore abc.jks \
        -deststoretype JKS