Change Details

Necessary to fix Terraform on macOS 26 ([ENG-11268](https://linear.app/comm/issue/ENG-11268/update-terraform-version)). This part of the commit was automated from the `flake.lock` update (`nix flake update nixpkgs --commit-lock-file`): ``` Flake lock file updates: • Updated input 'nixpkgs': 'github:nixos/nixpkgs/d879125d61a0be8ecb2afddaca8f2b0530db0260?narHash=sha256-zLvAJ%2BXTI7gIlUqlrKj8j4%2BPOZXDB6kUOnV0yBvSIMc%3D' (2022-12-29) → 'github:nixos/nixpkgs/0d7c15863b251a7a50265e57c1dca1a7add2e291?narHash=sha256-/aA9A/OBmnuOMgwfzdsXRusqzUpd8rQnQY8jtrHK%2BTo%3D' (2025-09-15) ``` Other than the `flake.lock` update, the rest was performed manually. I got rid of our custom arc build script since the upstream version seems to work now.

Necessary to fix Terraform on macOS 26 ([ENG-11268](https://linear.app/comm/issue/ENG-11268/update-terraform-version)). This part of the commit was automated from the `flake.lock` update (`nix flake update nixpkgs --commit-lock-file`): ``` Flake lock file updates: • Updated input 'nixpkgs': 'github:nixos/nixpkgs/d879125d61a0be8ecb2afddaca8f2b0530db0260?narHash=sha256-zLvAJ%2BXTI7gIlUqlrKj8j4%2BPOZXDB6kUOnV0yBvSIMc%3D' (2022-12-29) → 'github:nixos/nixpkgs/0d7c15863b251a7a50265e57c1dca1a7add2e291?narHash=sha256-/aA9A/OBmnuOMgwfzdsXRusqzUpd8rQnQY8jtrHK%2BTo%3D' (2025-09-15) ``` Other than the `flake.lock` update, the rest was performed manually. I'll explain inline.

Necessary to fix Terraform on macOS 26 ([ENG-11268](https://linear.app/comm/issue/ENG-11268/update-terraform-version)). This part of the commit was automated from the `flake.lock` update (`nix flake update nixpkgs --commit-lock-file`): ``` Flake lock file updates: • Updated input 'nixpkgs': 'github:nixos/nixpkgs/d879125d61a0be8ecb2afddaca8f2b0530db0260?narHash=sha256-zLvAJ%2BXTI7gIlUqlrKj8j4%2BPOZXDB6kUOnV0yBvSIMc%3D' (2022-12-29) → 'github:nixos/nixpkgs/0d7c15863b251a7a50265e57c1dca1a7add2e291?narHash=sha256-/aA9A/OBmnuOMgwfzdsXRusqzUpd8rQnQY8jtrHK%2BTo%3D' (2025-09-15) ``` Other than the `flake.lock` update, the rest was performed manually. I got rid of our custom arc build script since the upstream version seems to work nowI'll explain inline.