I ended up finding the file java.text
in the following 3 directories
COPY java.txt /usr/share/crypto-policies/DEFAULT/java.txt
COPY fips.java.txt /usr/share/crypto-policies/FIPS/java.txt
COPY future.java.txt /usr/share/crypto-policies/FUTURE/java.txt
I updated each to exclude SHA1withRSA
from
jdk.certpath.disabledAlgorithms
and this allowed my Keycloak Docker container to connect with TLS to my Postgres Docker container.