RHOAIENG-21691: mitigate undesirable /opt/app-root ownership and permissions change caused by a Dockerfile COPY

Before:

```
podman run --entrypoint /bin/bash --rm -it 7616b6ee0ff8 -c 'ls -AlFd $VIRTUAL_ENV'
drwxrwxr-x. 1 default root 40 Mar 16 09:57 /opt/app-root/
```

The Dockerfile command causing trouble:

```
USER 0
# Copy extra files to the image.
COPY ${RSTUDIO_SOURCE_CODE}/nginx/root/ /
```

After:

```
podman run --entrypoint /bin/bash --rm -it 237a5692c108 -c 'ls -AlFd $VIRTUAL_ENV'
drwxr-xr-x. 1 root root 38 Mar 14 14:16 /opt/app-root/
```

Author: jiridanek

codeserver/ubi9-python-3.11/Dockerfile.cpu

@@ -81,7 +81,7 @@ RUN yum install -y https://download.fedoraproject.org/pub/epel/epel-release-late
 COPY --chown=1001:0 ${CODESERVER_SOURCE_CODE}/supervisord/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
 
 # Copy extra files to the image.
-COPY ${CODESERVER_SOURCE_CODE}/nginx/root/ /
+COPY --chown=1001:0 ${CODESERVER_SOURCE_CODE}/nginx/root/ /
 
 # Changing ownership and user rights to support following use-cases:
 # 1) running container on OpenShift, whose default security model

rstudio/c9s-python-3.11/Dockerfile.cpu

@@ -116,7 +116,7 @@ RUN yum -y module enable nginx:$NGINX_VERSION && \
 COPY --chown=1001:0 ${RSTUDIO_SOURCE_CODE}/supervisord/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
 
 # Copy extra files to the image.
-COPY ${RSTUDIO_SOURCE_CODE}/nginx/root/ /
+COPY --chown=1001:0 ${RSTUDIO_SOURCE_CODE}/nginx/root/ /
 
 # Changing ownership and user rights to support following use-cases:
 # 1) running container on OpenShift, whose default security model

rstudio/c9s-python-3.11/Dockerfile.cuda

@@ -240,7 +240,7 @@ RUN yum -y module enable nginx:$NGINX_VERSION && \
 COPY --chown=1001:0 ${RSTUDIO_SOURCE_CODE}/supervisord/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
 
 # Copy extra files to the image.
-COPY ${RSTUDIO_SOURCE_CODE}/nginx/root/ /
+COPY --chown=1001:0 ${RSTUDIO_SOURCE_CODE}/nginx/root/ /
 
 # Changing ownership and user rights to support following use-cases:
 # 1) running container on OpenShift, whose default security model