feat: copy arm64 install script update

[ohnorobo]

This is a copy of @oceanapplications install script update from OutlineFoundation/outline-server#1700

This removes a check in the install script which disallowed arm64 machines. But per OutlineFoundation/outline-server#1700 CI and user testing arm64 does work.

This will require a server release to pick up the taskfile changes: https://github.com/OutlineFoundation/outline-server/pull/1700/changes#diff-f1d02bdf4c6eae0cd8305fa3c0081dc6899415740812e098c70b99abf0e7b465
DO NOT MERGE until after that release.

[fortuna]

@greptile review

[greptile-apps]

Greptile Summary

This PR extends the install script's architecture check to allow aarch64 and arm64 machines in addition to x86_64, enabling Outline Server installation on ARM64 hosts. The change mirrors the upstream server fix (outline-server#1700) which confirmed ARM64 compatibility via CI and user testing.

• The architecture guard in install_shadowbox() now permits aarch64 (Linux ARM64 naming) and arm64 (macOS/BSD naming) alongside x86_64, and updates the error message to list all supported architectures.
• No other logic is changed; the Docker image pull and container startup remain identical for all architectures.

Confidence Score: 5/5

Safe to merge — the change is a one-line guard expansion with a corrected error message and no other behavioural impact.

The diff touches only the architecture guard in install_shadowbox. Both aarch64 (Linux) and arm64 (macOS/BSD) are the same physical architecture reported by uname -m on different OS families, so including both is correct. The upstream server repo already validated ARM64 compatibility through CI and user testing. The rest of the install flow — Docker verification, directory setup, container start, Watchtower — is unchanged and architecture-agnostic at the shell level.

No files require special attention.

Important Files Changed

Filename	Overview
server_manager/install_scripts/install_server.sh	Architecture guard expanded to allow aarch64/arm64; error message updated accordingly. Change is minimal and correct.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[install_shadowbox called] --> B["MACHINE_TYPE = uname -m"]
    B --> C{Architecture check}
    C -->|x86_64| D[Continue installation]
    C -->|aarch64| D
    C -->|arm64| D
    C -->|Other| E["log_error: Unsupported machine type\nSupported: x86_64, aarch64/arm64"]
    E --> F[exit 1]
    D --> G[verify Docker installed & running]
    G --> H[Create Outline directory]
    H --> I[Configure ports, certs, hostname]
    I --> J[start_shadowbox container]
    J --> K[start_watchtower]
    K --> L[Wait for health check]
    L --> M[Installation complete]

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