Use unix pipe to capture environment variables (#32136)

The use of `NamedTempFile` in #31799 was not secure and could
potentially cause write permission issues (see [this
comment](https://github.com/zed-industries/zed/issues/29528#issuecomment-2939672433)).
Therefore, it has been replaced with a Unix pipe.

Release Notes:
- N/A

Cargo.lock

@@ -3161,6 +3161,16 @@ dependencies = [
  "memchr",
 ]
 
+[[package]]
+name = "command-fds"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2ec1052629a80c28594777d1252efc8a6b005d13f9edfd8c3fc0f44d5b32489a"
+dependencies = [
+ "nix 0.30.1",
+ "thiserror 2.0.12",
+]
+
 [[package]]
 name = "command_palette"
 version = "0.1.0"
@@ -10132,6 +10142,18 @@ dependencies = [
  "memoffset",
 ]
 
+[[package]]
+name = "nix"
+version = "0.30.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "74523f3a35e05aba87a1d978330aef40f67b0304ac79c1c00b294c9830543db6"
+dependencies = [
+ "bitflags 2.9.0",
+ "cfg-if",
+ "cfg_aliases 0.2.1",
+ "libc",
+]
+
 [[package]]
 name = "node_runtime"
 version = "0.1.0"
@@ -17124,6 +17146,7 @@ dependencies = [
  "async-fs",
  "async_zip",
  "collections",
+ "command-fds",
  "dirs 4.0.0",
  "dunce",
  "futures 0.3.31",