Added compatibility matrix for docker-build script (#268)

- matrix -m argument for build-docker.sh that lists compatible OS + ROCm combinations.
- ${DISTRO} is now case-insensitive.
- Added note to README.md to mention this flag.
- Removed --build-arg AMDGPU_RPM=${ROCM_RPM}, which is no longer used

[ROCm/rocprofiler-systems commit: 67bc147780]

projects/rocprofiler-systems/README.md

@@ -148,6 +148,9 @@ cd docker
 ./build-docker.sh --help
 ```
 
+> [!NOTE]
+> The `-m` argument can be used to show supported OS + ROCm combinations.
+
 **Example:** To set up an Ubuntu 24.04 + ROCm 6.4 + Python 3.12 environment for building and testing, run the following commands:
 
 ```shell