fix: WolfDisk CI — use pure-Rust FUSE (no libfuse C dependency)

Disabled fuser's default 'libfuse' feature which requires pkg-config
and libfuse-dev headers for cross-compilation. The pure-Rust /dev/fuse
implementation works on all Linux targets without any C library dependency,
fixing both x86_64-musl and aarch64-musl CI builds.

Removed Cross.toml and PKG_CONFIG_ALLOW_CROSS as they're no longer needed.

Co-Authored-By: CodeWolf <paul@wolf.uk.com>
Co-Authored-By: Wolf Software Systems Ltd <paul@wolf.uk.com>

Author: Paul C

.github/workflows/wolfdisk-release.yml

@@ -40,8 +40,6 @@ jobs:
         working-directory: .
 
       - name: Build static binaries
-        env:
-          PKG_CONFIG_ALLOW_CROSS: "1"
         run: cross build --release --target ${{ matrix.target }}
 
       - name: Get version

wolfdisk/Cargo.toml

@@ -9,7 +9,7 @@ repository = "https://github.com/wolfsoftwaresystemsltd/wolfdisk"
 
 [dependencies]
 # FUSE filesystem
-fuser = "0.14"
+fuser = { version = "0.14", default-features = false }
 
 # Async runtime
 tokio = { version = "1", features = ["full"] }