[towa48]

Description

The original arm64 build starts with error

/bin/filebrowser: line 1: syntax error: unexpected ")"

Additional Information

The original image for arm64 contains amd64 binary because the ${TARGETARCH} ARG is set to amd64.
The root cause: the default value is overrides buildx variable.

How to check the issue

1. Modify docker-compose for ARM64 by

entrypoint:
  - /bin/sh
stdin_open: true
tty: true

2. Start the container and check block of bites for binary file

$dd if=/bin/filebrowser bs=1 skip=18 count=2 2>/dev/null | od -An -t x1

3. For amd64 it will be 3e00 and for arm64 it will be b700

The second check

Or simply add RUN echo "The target architecture is ${TARGETARCH}" to Dockerfile.
And then check the ACTION logs for linux/arm64 build.
Dont forget to clear traces to remove additional image layer.

Checklist

Before submitting your PR, please indicate which issues are either fixed or closed by this PR. See GitHub Help: Closing issues using keywords.
/filebrowser/blob/master/README.md)

• I am aware that translations MUST be made through Transifex and that this PR is NOT a translation update
• I am making a PR against the master branch.
• I am sure File Browser can be successfully built.

[AnARCHIS12]

Thank you very much @towa48 for this contribution and the detailed analysis. The fix addressing TARGETARCH shadowing during multi-platform builds, the executable permissions for JSON.sh, the updated Docker actions, and the documentation enhancements are all verified and validated.