fix(ci): correct zig PATH and remove infrastructure from workspace

Fixes two issues discovered in v1.20.2 release workflow:

1. Cross.toml: zig was extracted to /usr/local/ but not in PATH.
   Now extracts to /opt/zig/ and symlinks to /usr/local/bin/zig.

2. Cargo.toml: Removed infrastructure/* from workspace.members since
   it contains no actual Rust crates, causing Docker build failures.

3. Dockerfile: Reverted infrastructure mkdir (no longer needed).

Refs #1874

Author: Test User

Cargo.toml

@@ -1,7 +1,7 @@
 
 [workspace]
 resolver = "2"
-members = ["crates/*", "crates/terraphim_grep", "crates/terraphim_merge_coordinator", "terraphim_server", "terraphim_firecracker", "terraphim_ai_nodejs", "infrastructure/*"]
+members = ["crates/*", "crates/terraphim_grep", "crates/terraphim_merge_coordinator", "terraphim_server", "terraphim_firecracker", "terraphim_ai_nodejs"]
 # Note: terraphim_usage and terraphim_ccusage are new crates in crates/*
 exclude = [
     # Experimental crates"

Cross.toml

@@ -2,26 +2,28 @@
 # See: https://github.com/cross-rs/cross/wiki/Configuration
 
 # Install zig in cross-compilation containers for zlob dependency
+# The zig tarball extracts to zig-linux-x86_64-VERSION/ containing 'zig' binary and 'lib/' directory
+# We extract to /opt/zig and symlink the binary to /usr/local/bin/zig which is in PATH
 [target.aarch64-unknown-linux-musl]
 pre-build = [
     "apt-get update && apt-get install -y curl tar xz-utils",
-    "curl -L https://ziglang.org/download/0.13.0/zig-linux-x86_64-0.13.0.tar.xz -o /tmp/zig.tar.xz",
-    "tar -xf /tmp/zig.tar.xz -C /usr/local --strip-components=1",
+    "mkdir -p /opt/zig && curl -L https://ziglang.org/download/0.13.0/zig-linux-x86_64-0.13.0.tar.xz | tar -xJ -C /opt/zig --strip-components=1",
+    "ln -sf /opt/zig/zig /usr/local/bin/zig",
     "zig version",
 ]
 
 [target.x86_64-unknown-linux-musl]
 pre-build = [
     "apt-get update && apt-get install -y curl tar xz-utils",
-    "curl -L https://ziglang.org/download/0.13.0/zig-linux-x86_64-0.13.0.tar.xz -o /tmp/zig.tar.xz",
-    "tar -xf /tmp/zig.tar.xz -C /usr/local --strip-components=1",
+    "mkdir -p /opt/zig && curl -L https://ziglang.org/download/0.13.0/zig-linux-x86_64-0.13.0.tar.xz | tar -xJ -C /opt/zig --strip-components=1",
+    "ln -sf /opt/zig/zig /usr/local/bin/zig",
     "zig version",
 ]
 
 [target.armv7-unknown-linux-musleabihf]
 pre-build = [
     "apt-get update && apt-get install -y curl tar xz-utils",
-    "curl -L https://ziglang.org/download/0.13.0/zig-linux-x86_64-0.13.0.tar.xz -o /tmp/zig.tar.xz",
-    "tar -xf /tmp/zig.tar.xz -C /usr/local --strip-components=1",
+    "mkdir -p /opt/zig && curl -L https://ziglang.org/download/0.13.0/zig-linux-x86_64-0.13.0.tar.xz | tar -xJ -C /opt/zig --strip-components=1",
+    "ln -sf /opt/zig/zig /usr/local/bin/zig",
     "zig version",
 ]

docker/Dockerfile.multiarch

@@ -109,10 +109,6 @@ COPY terraphim_server ./terraphim_server
 COPY terraphim_ai_nodejs ./terraphim_ai_nodejs
 COPY terraphim_firecracker/Cargo.toml terraphim_firecracker/
 
-# Create infrastructure directory to satisfy workspace member glob
-# (infrastructure/* is in workspace.members but contains no actual crates)
-RUN mkdir -p infrastructure
-
 # Replace any committed server assets with the CI-built frontend bundle.
 RUN rm -rf terraphim_server/dist && mkdir -p terraphim_server/dist
 COPY --from=frontend-builder /app/dist ./terraphim_server/dist