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https://oracle.github.io/odpi/doc/installation.html#macos
In case this link doens't work
To run ODPI-C applications with Oracle Instant Client zip files:

Download the 18, 12, or 11.2 “Basic” or “Basic Light” zip file from https://www.oracle.com/technetwork/topics/intel-macsoft-096467.html. Choose either a 64-bit or 32-bit package, matching your application architecture. Most applications use 64-bit.

Unzip the package into a single directory that is accessible to your application. For example:

mkdir -p /opt/oracle
unzip instantclient-basic-macos.x64-12.2.0.1.0.zip

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Convert a .cer to .pem file

openssl x509 -inform der -in certificate.cer -out certificate.pem

Compress an entire directory or file

tar -czvf name-of-archive.tar.gz /path/to/directory-or-file