hack: expose UBUNTUVERSION in env.sh and update doc (#27)

Signed-off-by: Xiaodong Ye <[email protected]>

Author: yeahdongcn

scripts/README.md

@@ -10,6 +10,8 @@ PLATFORM=linux/amd64 DOCKER_ORG=mthreads FLAVORS=vulkan ./scripts/build_docker.s
 PLATFORM=linux/arm64 DOCKER_ORG=mthreads FLAVORS=vulkan ./scripts/build_docker.sh
 ```
 
+> *📝 The `UBUNTUVERSION` build argument specifies the Ubuntu version (e.g., `22.04`, `23.04`, `24.04`, `25.04`) used as the base image for Docker containers. This argument is only applicable when building images with the `vulkan` flavor.*
+
 After running the build commands, Docker images will be created with tags in the following format:
 
 ```bash

scripts/env.sh

@@ -7,7 +7,9 @@ PLATFORM=${PLATFORM:-"linux/arm64,linux/amd64"}
 FLAVORS=${FLAVORS:-"musa"}
 DOCKER_ORG=${DOCKER_ORG:-"ollama"}
 FINAL_IMAGE_REPO=${FINAL_IMAGE_REPO:-"${DOCKER_ORG}/ollama"}
+UBUNTUVERSION=${UBUNTUVERSION:-"22.04"}
 OLLAMA_COMMON_BUILD_ARGS="--build-arg=VERSION \
+    --build-arg=UBUNTUVERSION \
     --build-arg=GOFLAGS \
     --build-arg=OLLAMA_CUSTOM_CPU_DEFS \
     --build-arg=OLLAMA_SKIP_CUDA_GENERATE \
@@ -21,5 +23,6 @@ OLLAMA_COMMON_BUILD_ARGS="--build-arg=VERSION \
 
 echo "Building Ollama"
 echo "VERSION=$VERSION"
+echo "UBUNTUVERSION=$UBUNTUVERSION"
 echo "PLATFORM=$PLATFORM"
 echo "FLAVORS=$FLAVORS"