Make Dockerfile-ollama-local detect arch

[grivanov]

Currently there is an ARG TARGETARCH that defaults to 'arm64', so the build fails on 'amd64'.

The documentation in Ollama-instruction.md doesn't mention this in Step 4.
It only provides this: docker build -f Dockerfile-ollama-local -t deepwiki:ollama-local . without mentioning the actually required --build-arg TARGETARCH=<arch>:

This PR aims to fix this and actually detect the build arch.

[gemini-code-assist]

Summary of Changes

Hello @grivanov, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the Dockerfile-ollama-local by introducing automatic architecture detection. Previously, the Dockerfile defaulted to arm64, causing build issues on amd64 systems and requiring a non-obvious build argument. The update streamlines the build process, allowing users to build the Ollama image without manually specifying the target architecture, thereby improving usability and preventing common build errors.

Highlights

• Automatic Architecture Detection: The Dockerfile-ollama-local now automatically detects the system's architecture (ARM64 or AMD64) during the build process.
• Removed Manual TARGETARCH: The explicit ARG TARGETARCH=arm64 and the previous requirement for a --build-arg are eliminated, simplifying the build command.
• Improved Build Robustness: This change prevents build failures on amd64 systems that previously occurred due to the hardcoded arm64 default, making the build process more reliable.

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[gemini-code-assist]

Code Review

This pull request correctly automates the architecture detection in Dockerfile-ollama-local, removing the need for a manual build argument. This is a great improvement for usability. I've added one suggestion to refactor the shell script logic using a case statement, which is more idiomatic and readable for this scenario.

[gemini-code-assist]

While the if/elif/else structure works, using a case statement is more idiomatic and readable for shell scripts when checking a variable against multiple possible values. This also provides an opportunity to use the more portable uname -m command instead of arch, slightly optimize the sed command by combining expressions, and remove unnecessary semicolons.

RUN OLLAMA_ARCH=$(uname -m | sed -e 's/aarch64/arm64/' -e 's/x86_64/amd64/') && \
    case "$OLLAMA_ARCH" in \
        arm64) \
            echo "Building for ARM64 architecture." \
            ;; \
        amd64) \
            echo "Building for AMD64 architecture." \
            ;; \
        *) \
            echo "Error: Unsupported architecture '$OLLAMA_ARCH'. Supported architectures are 'arm64' and 'amd64'." >&2 && \
            exit 1 \
            ;; \
    esac && \