Make CPU builds parallel and customizable AMD GPUs

The linux build now support parallel CPU builds to speed things up.
This also exposes AMD GPU targets as an optional setting for advaced
users who want to alter our default set.

scripts/build_linux.sh

@@ -6,6 +6,7 @@ export VERSION=${VERSION:-0.0.0}
 export GOFLAGS="'-ldflags=-w -s \"-X=github.com/jmorganca/ollama/version.Version=$VERSION\" \"-X=github.com/jmorganca/ollama/server.mode=release\"'"
 
 BUILD_ARCH=${BUILD_ARCH:-"amd64 arm64"}
+export AMDGPU_TARGETS=${AMDGPU_TARGETS:=""}
 mkdir -p dist
 
 for TARGETARCH in ${BUILD_ARCH}; do
@@ -14,6 +15,7 @@ for TARGETARCH in ${BUILD_ARCH}; do
         --build-arg=GOFLAGS \
         --build-arg=CGO_CFLAGS \
         --build-arg=OLLAMA_CUSTOM_CPU_DEFS \
+        --build-arg=AMDGPU_TARGETS \
         --target build-$TARGETARCH \
         -f Dockerfile \
         -t builder:$TARGETARCH \