[shortfin] Use custom manylinux dockerfile in build_linux_package.sh. (#709)

Package builds started failing last night when the `latest` upstream
manylinux dockerfile switched to gcc 14:
https://github.com/nod-ai/shark-ai/actions/runs/12371699664/job/34528374484

```
  Running command Building wheel for shortfin (pyproject.toml)
  -- The C compiler identification is GNU 14.2.1
  -- The CXX compiler identification is GNU 14.2.1

...

  [325/365] Building CXX object src/shortfin/local/CMakeFiles/shortfin_local.dylib.objects.dir/device.cc.o
  FAILED: src/shortfin/local/CMakeFiles/shortfin_local.dylib.objects.dir/device.cc.o
  /opt/rh/gcc-toolset-14/root/usr/bin/c++ -DCPUINFO_SUPPORTED_PLATFORM=1 -DSPDLOG_COMPILED_LIB -DSPDLOG_FMT_EXTERNAL -DSPDLOG_SHARED_LIB -D_SHORTFIN_BUILDING_DYLIB -Dspdlog_EXPORTS -I/home/runner/work/shark-ai/shark-ai/c/shortfin/src -I/home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/src -I/home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/spdlog-src/include -I/home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/fmt-src/include -isystem /home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/shortfin_iree-src -isystem /home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/shortfin_iree-build -isystem /home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/shortfin_iree-src/runtime/src -isystem /home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/shortfin_iree-build/runtime/src -isystem /home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/shortfin_iree-src/third_party/cpuinfo/include -isystem /home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/shortfin_iree-build/runtime/src/iree/base/internal/flatcc -isystem /home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/shortfin_iree-src/third_party/flatcc/include -isystem /home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/shortfin_iree-build/runtime/src/iree/schemas -O3 -DNDEBUG -std=gnu++20 -flto=auto -fno-fat-lto-objects -fPIC -fvisibility=hidden -fvisibility-inlines-hidden -Wall -Werror -pthread -I/home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/shortfin_iree-src/third_party/flatcc/include/ -I/home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/shortfin_iree-src/third_party/flatcc/include/flatcc/reflection/ -MD -MT src/shortfin/local/CMakeFiles/shortfin_local.dylib.objects.dir/device.cc.o -MF src/shortfin/local/CMakeFiles/shortfin_local.dylib.objects.dir/device.cc.o.d -o src/shortfin/local/CMakeFiles/shortfin_local.dylib.objects.dir/device.cc.o -c /home/runner/work/shark-ai/shark-ai/c/shortfin/src/shortfin/local/device.cc
  In file included from /home/runner/work/shark-ai/shark-ai/c/shortfin/src/shortfin/local/device.cc:10:
  /home/runner/work/shark-ai/shark-ai/c/shortfin/build/cmake/default/_deps/fmt-src/include/fmt/ranges.h:211:49: error: self-comparison always evaluates to true [-Werror=tautological-compare]
    211 |                      integer_sequence<bool, (Is == Is)...>) -> std::true_type;
        |                                              ~~~^~~~~
  cc1plus: all warnings being treated as errors
```

This switches to our own downstream dockerfile, defined here:
https://github.com/nod-ai/base-docker-images/blob/main/dockerfiles/manylinux_x86_64.Dockerfile,
which is pinned to an older version of the base image (and thus gcc).

Tested successfully here:
https://github.com/ScottTodd/shark-ai/actions/runs/12378199850

Author: ScottTodd

shortfin/build_tools/build_linux_package.sh

@@ -37,13 +37,18 @@ REPO_ROOT="$(cd "$THIS_DIR"/../../ && pwd)"
 SCRIPT_NAME="$(basename $0)"
 ARCH="$(uname -m)"
 
-# Note: we can switch to https://github.com/nod-ai/base-docker-images as needed for extra deps.
-MANYLINUX_DOCKER_IMAGE="${MANYLINUX_DOCKER_IMAGE:-quay.io/pypa/manylinux_2_28_${ARCH}:latest}"
 PYTHON_VERSIONS="${OVERRIDE_PYTHON_VERSIONS:-cp311-cp311 cp312-cp312 cp313-cp313}"
 OUTPUT_DIR="${OUTPUT_DIR:-${THIS_DIR}/wheelhouse}"
 CACHE_DIR="${CACHE_DIR:-}"
 SHORTFIN_ENABLE_TRACING="${SHORTFIN_ENABLE_TRACING:-ON}"
 
+if [[ "${ARCH}" == "x86_64" ]]; then
+  MANYLINUX_DOCKER_IMAGE="${MANYLINUX_DOCKER_IMAGE:-ghcr.io/nod-ai/manylinux_x86_64@sha256:4acf83343706d1e37252d6001ded3c97a73bc38620580f855b4e65e35ddc5681}"
+else
+  # TODO: publish a multi-platform manylinux image and include more deps in all platforms (rust, ccache, etc.)
+  MANYLINUX_DOCKER_IMAGE="${MANYLINUX_DOCKER_IMAGE:-quay.io/pypa/manylinux_2_28_${ARCH}:latest}"
+fi
+
 function run_on_host() {
   echo "Running on host"
   echo "Launching docker image ${MANYLINUX_DOCKER_IMAGE}"