Dockerfile for sql server

Hi all, has anyone of you be able to create a proper, working, dockerfile for KC and Sql Server?
I tried this dockerfile but it is not working

FROM quay.io/keycloak/keycloak:latest as builder

# Enable health and metrics support
ENV KC_HEALTH_ENABLED=true
ENV KC_METRICS_ENABLED=true

# Configure a database vendor
ENV KC_DB=mssql

COPY mssql-jdbc-12.2.0.jre8.jar /opt/keycloak/providers/mssql-jdbc-12.2.0.jre8.jar

WORKDIR /opt/keycloak
# for demonstration purposes only, please make sure to use proper certificates in production instead
RUN keytool -genkeypair -storepass password -storetype PKCS12 -keyalg RSA -keysize 2048 -dname "CN=server" -alias server -ext "SAN:c=DNS:localhost,IP:127.0.0.1" -keystore conf/server.keystore
RUN /opt/keycloak/bin/kc.sh build

FROM quay.io/keycloak/keycloak:latest
COPY --from=builder /opt/keycloak/ /opt/keycloak/

# change these values to point to a running sql server instance
ENV KC_DB=mssql
ENV KC_DB_URL=jdbc:sqlserver://mssql:1433;databaseName=KC

ENTRYPOINT ["/opt/keycloak/bin/kc.sh", "start", "--optimized"]

Thanks a lot