chore: fix errors in .github/workflows/rust-release.yml and prep 0.0.2504292006 release (#745)

Apparently I made two key mistakes in
https://github.com/openai/codex/pull/740 (fixed in this PR):

* I forgot to redefine `$dest` in the `Stage Linux-only artifacts` step
* I did not define the `if` check correctly in the `Stage Linux-only
artifacts` step

This fixes both of those issues and bumps the workspace version to
`0.0.2504292006` in preparation for another release attempt.

codex-rs/Cargo.lock

@@ -469,7 +469,7 @@ dependencies = [
 
 [[package]]
 name = "codex-cli"
-version = "0.0.2504291954"
+version = "0.0.2504292006"
 dependencies = [
  "anyhow",
  "clap",
@@ -524,7 +524,7 @@ dependencies = [
 
 [[package]]
 name = "codex-exec"
-version = "0.0.2504291954"
+version = "0.0.2504292006"
 dependencies = [
  "anyhow",
  "chrono",
@@ -559,7 +559,7 @@ dependencies = [
 
 [[package]]
 name = "codex-repl"
-version = "0.0.2504291954"
+version = "0.0.2504292006"
 dependencies = [
  "anyhow",
  "clap",

codex-rs/Cargo.toml

@@ -12,7 +12,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.0.2504291954"
+version = "0.0.2504292006"
 
 [profile.release]
 lto = "fat"