Update Linux binary release workflow and Dockerfile for PHP 8.5

[igancev]

Description

Update the Dockerfile and Linux binary release workflow to use the new PHP 8.5 builder image.

What to do

• In Dockerfile, update the base image from bin-builder:0.0.2 to the new PHP 8.5 version (e.g., bin-builder:0.1.0)
• Verify build-binary.sh produces a working binary locally

Verification note: To verify this PR, temporarily enable the build trigger for PRs in the workflow file and comment out the final publication/upload step. Ensure CI passes, then revert these changes before merging. Successful CI run is a prerequisite for the merge.

Definition of Done

Linux amd64 binary builds and runs correctly with the new builder image.

Blocked by: #44, #45

Branch strategy: create PR targeting feature/php-8.5, not main.