docker prefer COPY to ADD in dockerfile (#15394)

#### Why I did it
Docker best practices prefer COPY to ADD
https://docs.docker.com/develop/develop-images/dockerfile_best-practices/#add-or-copy
##### Work item tracking
- Microsoft ADO **(number only)**: 17418730

#### How I did it
Use the COPY command as opposed to ADD unless working with a tar file.

platform/p4/docker-sonic-p4/Dockerfile.j2

@@ -81,7 +81,7 @@ RUN sed -ri 's/^(save .*$)/# \1/g;
              s/^client-output-buffer-limit pubsub [0-9]+mb [0-9]+mb [0-9]+/client-output-buffer-limit pubsub 0 0 0/ \
             ' /etc/redis/redis.conf
 
-ADD port_config.ini /port_config.ini
+COPY ["port_config.ini", "/port_config.ini"]
 COPY ["start.sh", "orchagent.sh", "config_bm.sh", "/usr/bin/"]
 COPY ["supervisord.conf", "/etc/supervisor/conf.d/"]
 COPY ["files/configdb-load.sh", "/usr/bin/"]